Malicious PDF — malware analysis report

Static analysis result for SHA-256 8618f11a7d8f9fa6…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 20:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3268a34bf50a1bc2b7fd2d5a2e464181 SHA-1: 8e4718092434286f2a027d96d8b9f199fca8e167 SHA-256: 8618f11a7d8f9fa65df9fbd290f96f5c4c8282f7e5d550452ee80de47068bf1d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a callback phishing lure, instructing the user to call a phone number. Several heuristics indicate the PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or redirect users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 http://pnktools-th.org/ckfinder/userfiles/files/77353751334.pdf In PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/josebuw.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051902310183.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/pubuguxaxetip.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/gazigeken.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/wibifuka.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082657a76092---savologa.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/81203710251.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xupafikexovabizit.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/mawutupeguzuj.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/fosuw.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609758bf878e8---digikenijekutiwuwoxugujew.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/28549191140.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/50650257125.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/kafidofep.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/8126865650.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/72983537057.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/953abc483f0b5f599f84bd399548a224/93720786167.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f19f155ed03---wapovazebe.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/stvdek3qlo476j58flsscbr2gs/22014993528.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/21103487695.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0a93145c088815e5e8784867d344e16c/xonukedulelebo.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/dedusodatulorapakomafosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=toshiba+air+conditioning+instruction+manualsPDF 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_off0000b7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 14716 bytes
SHA-256: 442978a8e2ac4eb3c3130c3d463a586acc1fda87548d567c84849e0753f95c63
font_02_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 10888 bytes
SHA-256: b297cffde0b03d3ca9c3275700b0382670ab83f51094eaeff3959fc2d6edeb25

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