Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7ff819952de65d…

MALICIOUS

PDF

83.8 KB Created: 2021-07-13 20:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29b9d23e34165e545affa5b557388b22 SHA-1: f31c79b4314db74bd96e897203873727b42962f1 SHA-256: 6e7ff819952de65d92cd0753e9df4b921d9eebc14c4881154ad38e5c90702a86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=body+weight+chart+for+baby PDF link annotation
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4db27d447fc276b28ef9995438b21d9c/sazusixulutilifojonowigi.pdfIn PDF document text
    • https://digireg.com/upload/72021391409.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d306e73822457b270156ca70dca86919/fijikonagirozujupa.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/6439116765.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/21869896846.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/16494520997.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/92517544434.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/gitotipavupa.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4dc6e804397343742ce5b2c4924e538a/fobibasolotazesukiz.pdfIn PDF document text
    • http://primaneighbors.com/userimages/62485323301.pdfIn PDF document text
    • https://btegypt.com/file/38096317277.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17983aa76---86443699215.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/datatikefobovum.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/wifekegep.pdfIn PDF document text
    • http://technocom.pl/editor/file/vifupinufigifewapeno.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c0813d903---zebiketobiroku.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c930aa1842---puvuvoxefidemogilutup.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/melemekalimugixapitek.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/95f567eccb8fca99fe1a03e4cf3ef292/vevizipuzijogajafuwalisez.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c64549123e1e9df5bcf98ad89619fc84/rejowolezekizika.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4ceb54cd---pesatawivawufilenukem.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/70160525843.pdfIn PDF document text
    • http://altinay-law.com/images/file/2641300219.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/26186057996.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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 16412 bytes
SHA-256: 41382632e8663ff07b4adf7909c90de58fdaafb53c5ebbfb84a6a3003a63bbf5
font_01_sfnt_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D2 10828 bytes
SHA-256: 653ebba89745e6e2f54c42ea52cb6f32de19e104a713ead4febd065478ecb570

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