Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc0510dae39ae2d…

MALICIOUS

PDF

83.0 KB Created: 2021-07-26 15:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64e7313f8843aaf94962bf1b1433a716 SHA-1: cc253063a40c7e57fc71639c45a70f2ebc4bcb1f SHA-256: 7dc0510dae39ae2dfc208043d5b57384ea7aeb2fbe523ea5b7e8fe93fc4a5370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the link farm and the detection as a Trojan indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7723f2ff9---pijuwakirivaridugipoguxag.pdf In PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/4shtdrmnirgkop8lprm1al4ag0/71990234592.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/43305729795.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mvtj4n3tkjjgqm8d1s9oh5lv6p/56025524929.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/93579334945.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/51299687869.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/romezukokajirazukogunixit.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/51a7003e6c0ca4a53b82431058e0c027/85585600467.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91719454293.pdfIn PDF document text
    • http://kfbi.ru/content/file/guputajamilibotanafo.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210726_5D53C2CDE682DA8E.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/siriponiraxugekegunajebep.pdfIn PDF document text
    • http://mmcaana.com/clients/29274/File/82433051883.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/25565154045.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/nuvijifunaxugadelum.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f199a7c644---jirilumumoduseraranirevip.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d3e36214b---39534721937.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1f0cf55b---lapivube.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/5322293168.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a018eefe6---notamin.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/banasadakoka.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/cbe1f67c5be947f67c3c0e507f4b346a/bodebisepij.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/nuxapivexalorowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=typing+master+free+download+full+version+2018+offlinePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 11672 bytes
SHA-256: 987240445ab8fb5873181405bf608107361d596951097920d602cbce2ce8b1e3
font_02_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 16940 bytes
SHA-256: 228f908cd44ab9962cc10aac5c4238719605998882752c8eed23bbb8764f5f74

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