Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19ced151eeb6fae…

MALICIOUS

PDF

90.2 KB Created: 2021-08-09 23:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cba8838f443e70406428256739536b49 SHA-1: 27b492e1cb3c7fe13dae32e6dfae6767f6c87d45 SHA-256: c19ced151eeb6fae0d6512e03662a9cece791d480f921108301a1a9286c9ecdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the high number of external links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=fce+listening+test+10+answers PDF link annotation
    • http://amindoost.ir/images/upload/files/bamogevulemejuzitafojow.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/59790282607.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/kepogipazojomatimidufebiz.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ueivtesrvt6oomhrluqna10i2f/xavetapipaderetubufisagu.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a38aad03539c2628627a945485fc4d92/takedafaxogiwexinuno.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/fd35a817aca3556ebe1ad2b2ea075019/40994822244.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c4fad44d---tedewurijofa.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160865ba16c24d---48909499383.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/wilegalavawasuditupefupag.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08bc9eef62---rizunitimosakujiw.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d4de7dd3---zakuputilawikarobisun.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/27543566276.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/zokametatuzotegimosemo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/udm0jn1bf36vau5vaqbk8n29f2/lugusevukilexabarugo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160831de673550---zazomijakoget.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/32772316284.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1467cfa64077161719daabe3f45178c2/kidefimojejixinudujomex.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a01ff40d3---96263801026.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092972f6d45d---diriv.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607320594dfd4---40034318828.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b911561ca---57075353564.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a87c9ce9797889220c28491af2df27f3/dudawefosarome.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607967f195c34---tuwezubobojomapudak.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gedewegimapo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mnl7eh9giksq2ghq47pfbvgbc1/vakanivekapute.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02d57c71f---42933760915.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 10524 bytes
SHA-256: f753283c782c7c0fa76de880d24d719b098dc859cbfc208ab0617e91521cd46e
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 18076 bytes
SHA-256: 66cfb07da9a1184418dbd49b512b3b025dc3396a92afeb41ef21e765ebf4d5e8
font_03_sfnt_off000142e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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