Malicious PDF — malware analysis report

Static analysis result for SHA-256 85eedf3a82aceca6…

MALICIOUS

PDF

90.1 KB Created: 2021-09-03 13:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89351118c365074f95ebbc64afd5befe SHA-1: 37a603d5a4db8937c27a08b6efe935661c4e825c SHA-256: 85eedf3a82aceca6d168e2192862f1e13afcc49ab88b160fc5c08c8cf25fd58c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a spearphishing attachment to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d45868fc1d9c964f70d46c753fd21843/37894397455.pdf In PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ektos78vp4pr7u6fcpkdleg19p/84701222133.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09b4a70fe---gafojanewezimopazevitosid.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/77525555122.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/fijaduvuga.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/zivamovezigatotovub.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837e067e644---60153531473.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mh6rpvhk7al11qtgugoam01q5e/49429572317.pdfIn PDF document text
    • https://edarky.net/data/file/rukeluzut.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a36b7766992---vemuze.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/7124072512.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/84206443445.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/tafovakura.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/nv91a4rb5tv2gcs1e1247k811h/nopelevanewizozirexoduz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b452660665---43648640971.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dff2e4d96fa---diwolopurukavomuj.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///zegop.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a690fb8ce5---xaxidekuwomoxasegozedema.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/13334637067.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/karokixovexujolu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee06c92344b---luxatov.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/valalodeseg.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dc1124102---14646201153.pdfIn PDF document text
    • http://www.grade.orgIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=metabolismo+del+hierro+pdf+2014PDF 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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 11164 bytes
SHA-256: 8b2f785d1afc49984c59db3c6aff633e38fcfd7f5300f43f1ba6b694885bfe9c
font_01_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 20684 bytes
SHA-256: 57e745597cb6b8b7a59eedff388afef396653fb04ad07f878c34e35e7c9ab692

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