Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1f9cc0657d10b9…

MALICIOUS

PDF

82.8 KB Created: 2021-08-16 08:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88504519d18ce8b0a04ecdd2c5faeb0a SHA-1: 474dcf5b813aa4ddd3d5d63105edaf5bcdeabc0f SHA-256: 7a1f9cc0657d10b9058bbdcfba5e20280c21c4f20d557817ae158d10245268b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://inwebjor.ru/uplcv?utm_term=ghulam+t%C3%BCrk%C3%A7e+dublaj+full+izle PDF link annotation
    • http://deborahkay.com/ckfinder/userfiles/files/xakefomuwozak.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/44896087867.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/2503556837.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/vukuda.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/79355727553.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/zurateridoter.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/monasewafisubumipuzagaxol.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/98782544546.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afba5832dff---40253686135.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160860eaa5d913---96283803241.pdfIn PDF document text
    • http://apcmagon.com/userfiles/teroxuwukugad.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k4gjs71mbtmo53i4qug5gec983/11658264187.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/medixinokigafonunenuk.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/5b9a922c65f094690bb5aeb1cf8c1e93/pibamijoxozalepagirumi.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/88815212181.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/32645012424.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aba070f31b9---3745275499.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/87494533796.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/94281679026.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a239ea94ed9b1f3a5b2ef4853c26550b/553624105.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/46065912898.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/tabojatexeloxewofota.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/xikixemerebojubutu.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/bejuwelonerolejif.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf7c767f0---jivup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29E 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 11180 bytes
SHA-256: d3ccac31e781196a3ff883d10e7245818d19abf61de5458e9b217da0f95f9733
font_02_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 20004 bytes
SHA-256: ae889941ae79c19793446b37c3dc2c11e518f7c2fffb2c5dd57f8f9213e0df20

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