Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b44b2ce3c25f1e9…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 00:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a6442273851dabc4e796ccb24002ccd SHA-1: 8f5d2ab19177eae216cd65ab9bbed069ad594a0e SHA-256: 6b44b2ce3c25f1e9392af4e4f5912643fc1c81a7c89bf4fd5fd215a4c49f73e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating it's part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link farm.

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 http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8ab410b3---dazixitolaxakekum.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90d7c3083---keguvuwevolu.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32fd25079---6222815095.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899e9084fb4---49424402965.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210605_75568442D7DAE942.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d729fbe7abc---jalelesitoselomefo.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d7969a759a2---28645982019.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b74cbccfccf---muzeribujiwizotiwutag.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077c22aae598---91117538151.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6nged8t1638p2knq0ibrpgb6sm/83286343020.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074338d7fb38---kufofob.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ecfae1da7---gikanilenunutasak.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e3f9jf2rn8dk7od0jeqqjb53k1/62558403299.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/7372491673.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607027a389483---75108278551.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a95cc1cc549---bawutozeranokosevu.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e15b297a1cedc0a95cba22041a7f542a/rafaweposomo.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9244bac3458a84b5acde7b9e3f7002d2/6852891985.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3dda3956c---robirigaruz.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15c38f9ca---60044667149.pdf
    • http://abpaluso.com/upload/file/19986553695.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7d1a44739c1b4b50b013d539ed471d29/53883581017.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/risikefokadexiramopiki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+you+find+diameter+from+circumference
    • 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_off0000f85f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 16792 bytes
font_01_sfnt_off00011071.bin
e65a838349ae947358e98a9fea8ee3cfe6446297a2a53652a402598e0b4636e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 18072 bytes
font_02_sfnt_off00013fd4.bin
17a733962a0ceb6115581afb206bc4bb2cc0453e4f275e9bc0c71778ad92e605
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD4 10712 bytes