Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74714c0e5ef003c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 23:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 836d94707ee3d27fe6e75d7c60015b29 SHA-1: 1adf19358e7787cebf22e3b1a16ef8035e988f08 SHA-256: c74714c0e5ef003c8c0b29c56d8a1ca77de737b47b13b5dc9f208d0f5fa4e682
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to various PDF files hosted on compromised websites and disposable domains, suggesting an attempt to distribute malicious content or phish for information. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://alpinashop.bg/files/44808150315.pdf In PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210913/file/16314872042237.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613734a2f14e3---18078653863.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161337a90f1b01---41285170112.pdfIn PDF document text
    • http://lovesenergy.com/file/rezopogije.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/0qn4lkd3e2ebtrfa72vdj1ge81/zupuge.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/96270324103.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/93451008086.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/fejexalilowekadopiza.pdfIn PDF document text
    • http://irollee.com/userfiles/file/lusora.pdfIn PDF document text
    • http://paradoxine.com/upload/files/tusotobodujare.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/555de28e1f9a3299eb5dabc9fa6d787a/nubez.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/wupuzekagexuwatim.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/gepexa.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/xejepexafamuga.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/luneluxuxukeke.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/76258128253.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/sesf6bmth8mh910q9am3mm3fjv/gubiwagi.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/xevatamonogogajedowevavi.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/nedelerifukufa.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090306122870554.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2c00179b---25330849522.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/35918906461.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5ef062744---nalenawipitid.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/60481430717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pes+2018+file+download+for+androidPDF 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_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 10840 bytes
SHA-256: c301643899b1f0b902a955b7a49124032887169be461b0d5e9dc4e5ef19a9192
font_02_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 17344 bytes
SHA-256: 89a463f00b03a8c936231e300526891ab64da9abaae0343e5625bab8e94338f3

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