Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d06b8edc22b9e57…

MALICIOUS

PDF

96.3 KB Created: 2021-07-03 02:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d9585a390d227fc01a4964684ec6494d SHA-1: 537ca297732323f26514d2b37da5045ef8b96d97 SHA-256: 6d06b8edc22b9e57b2cdaf89fdb05d94a656e48b32d603f7546c584611d5ab9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://laborke.ru/uplcv?utm_term=tricep+workouts+for+men PDF link annotation
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/946ace8d875d97f5658426f2e6086931/zufejik.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4170512d26---zufejodex.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d84ace270cf---guvusowotapezudewipozis.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/feguravu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dd0ae73a05b5da52a039a400f22bfa37/kevenum.pdfIn PDF document text
    • http://ministerium.pt/files/metele.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160816d6b5f8d9---badewuloxofam.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8847afb2---wereziril.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/l3n2jk4pa7l1ebqnoagjpocimm/radixapow.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/7675416409.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210624062132_3egz1j.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/obtio9n43a6857j1kc1ktmugiq/16316258575.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/dakafixagim.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/be8e8f10f26d8964a72d746cc5507e65/winabosirenigexi.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3db7f670c1c2678aca3a671a0ed42d83/zenajagarikitotirusom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbab53c9ff8---5057025750.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/19151456267.pdfIn PDF document text
    • https://promise-land.com/upload/file/padixatowujotazu.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/tuxovuputagaloguxifatu.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zokumukarewevaz.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/40030514576.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/nodiborizazusewanuwugabi.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/fogadinegagal.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/0ef82a50f13b4613b331e30b0d562d6e/tasitelinaruwupabowizenut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 17160 bytes
SHA-256: 1020446c513acdd493355752b985ab5567352c962cf21bad4c823c5c53596c87
font_01_sfnt_off000143bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BF 10672 bytes
SHA-256: c292b32450e2674e47c1e591b96c2c95fc8c6fc276c24f64360294a7babafcc4
font_02_sfnt_off00015c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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