Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b314e3a4be9ede…

MALICIOUS

PDF

66.1 KB Created: 2021-09-28 16:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d739f618017ad0b46edd0c50fda00ced SHA-1: d649e74c4819598e283dc1c07ff278709f6a69da SHA-256: f8b314e3a4be9ede795095da53944ebd17db6fcc69ad1448012531f5748173a7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_IMAGE_LURE' indicates the document likely presents an image to trick users into interacting with a hidden link, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=how+do+i+turn+off+voice+assistant+on+my+android+phone PDF link annotation
    • http://tutaylamhet.com/storage/ckfinder/files/vusego.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/75253329620.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/44927571795.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/xepulofisut.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161413b725c9b5---jezepekegom.pdfIn PDF document text
    • http://czyxchem.com/upload/files/sekidepegal.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/rifojoper.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/jisarob.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/30965889140.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210905175028.pdfIn PDF document text
    • http://newshop.jp/archive/file/44712295054.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/pamuzijuzat.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a073c7da7072e7426c7b5940d60bd553/39342146301.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/nutakituz.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161375c1a2c421---luwelebamokugas.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/jovenilomu.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_off0000a617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA617 11196 bytes
SHA-256: 428fbce94ed29b8118098a5591049308f8d2945277eb4314793c3bacc87522ef
font_01_sfnt_off0000c031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 14076 bytes
SHA-256: 08f13e053468c342ce8a2ebdbd035ec5a23a87d9b9a9e255774ca4d4c693d3d7

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