Malicious PDF — malware analysis report

Static analysis result for SHA-256 77740ea653e8b789…

MALICIOUS

PDF

103.0 KB Created: 2021-07-03 10:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9281eb978410d5ff8574d7c67a2d083d SHA-1: fed5505957baabf59c92ae82ba0af7bdbc6774f6 SHA-256: 77740ea653e8b7890a574b04b48ba026323741443988d74551797a63c80f5e17
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a multi-stage attack.

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 http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/b5hsdllrucbksj564loamcevc2/41322111399.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/mepawidabuju.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/939a18dcfd0ecc2cf22056e275a84824/degadaxexekegelufulidabex.pdf
    • http://brlairport.com/images/file/61771375143.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70d545fbd---17548360225.pdf
    • http://muszempilla.com/files/file/xowemowuxarozotavaf.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c09b17a9---89436412765.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/26r2kni7tps7u95q8ra9idj6d1/95781495979.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/e6d9abb76d66815aa532f0df221e68e7/vewewuputakasepuwef.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/43555503253.pdf
    • http://anhbanglaw.com/userfiles/file/94690672723.pdf
    • https://musikkursus.dk/userfiles/file/bireg.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/91ca32b243ccf6304ac26ce76f0428e8/vabilafaluvekupux.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/aec3bba78bf971617bbbb95deffc7c6d/90424734800.pdf
    • https://asset-books.com/userfiles/file/jojewolisob.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d5a9ecaaf6f858583e64b8a126cd275b/70055318768.pdf
    • https://avgdesign.com/userfiles/file/ruguwujuxibagejiju.pdf
    • http://sgd42.ru/userfiles/file/22021934893.pdf
    • http://op-gold.com/ck_image//files/33632844365.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/54f74351c8d31de6c65e82e07307ed8e/kafuvopowedomalenegawe.pdf
    • https://alakharia.com/public_html/userfiles/file/62485120742.pdf
    • http://elijasprojekts.lv/files/file/galixixifotumikevi.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc80a48181d---57744536812.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=meaning+of+inconsonance
    • http://medlab.webd.pl/upload/file/21393535483.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_off000135da.bin
bf49a3a90d98c38aedb1e424c8c7ef27e0afede6bb0bae4d44482418c455e114
pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 16184 bytes
font_01_sfnt_off00015fb5.bin
764ce80a2fc6899f7c4ec2ebe1911ca1dbda07e77e1fc950cf84d4bcfc85c544
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB5 10260 bytes
font_02_sfnt_off000176e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x176E8 16792 bytes