Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b945d194470a323…

MALICIOUS

PDF

94.4 KB Created: 2021-06-28 23:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76cecf49e324e158d4b9d123a74e8d5d SHA-1: b5db6be909a5462dc26360db7227a12302739e86 SHA-256: 7b945d194470a323b22de477b59f53d4fd70f8c3628f5995a0855b9bd2f2d03a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://pistant.ru/uplcv?utm_term=examples+of+isometric+and+isotonic+exercises
    • https://mebelihome.ru/upload_picture/tusedaj.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210622_E790BC2575AB7D4B.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/4a462457fa40d9f63e456139109d1a88/verapab.pdf
    • http://al-bandak.com/userfiles/file/7642699984.pdf
    • http://ranaghatpchsschool.org/userfiles/file/wogiraxatolo.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ebd654b2---24085630112.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc050eeea1---nesudalazivetewoja.pdf
    • http://adaviestransportltd.com/userfiles/file/xijemadomipuxosinew.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/kutukovowirodakixet.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab1378b75---wuvugowix.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa62a37fe---fipazutovisimi.pdf
    • https://krono-original.vn/Images_upload/files/58766893664.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7apoanob0dvc99jdgn1bth952n/72187313958.pdf
    • https://iva-vietnam.com/userfiles/file/bivagugosagonojivatewab.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/be07559fc5fb8b36e3efa57775c0a537/jukefisedabejasotipis.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/nibad.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/4431498100477dd1f6bb2d41c71c168b/62807190959.pdf
    • http://promocode.lu/userfiles/files/golokasufubabosalowa.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16083f026590c0---wewalawibubobeletu.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c869c8da492---birafurelukinelulugegovem.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd28d05aad---48850733883.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b84be994---11107819495.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7fd14574f---22017552487.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f133c8be55---39762072106.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/15347084183.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608adc09d6022---94503325421.pdf
    • https://spacio.hk/attachment/file/33743080763.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d3f.bin
fceaedd7de2fc09063aa5e5048d597682499d22f2c4e342c79d7f706e212af4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 17572 bytes
font_01_sfnt_off00013ac0.bin
f6470eecc0005ae592b489084f2fe191545b0caadc0a3c3cf60f69e824e0c593
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC0 10868 bytes
font_02_sfnt_off000153d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153D8 16792 bytes