Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a735bfee76f6e3d…

MALICIOUS

PDF

96.0 KB Created: 2021-06-26 00:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a44a8cf2bd9071afc04e14c61db39fb4 SHA-1: 06decbd997774c706f12b8d4ce6a8b6292dbf98c SHA-256: 4a735bfee76f6e3d0e36b7a2a9d66b866cbd8df41941c693f6f3434abc07641c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm attack pattern. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish or distribute further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b1e81ea5e4351959168a6a8221692b3c/pirelupedi.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608089c75a4bb---81675202091.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c090036ca---wesirudipik.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c135f7c4---78826013987.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093587a14c2c---nobamudel.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/843e284562e26bbd3290b60a968ac78d/10669284641.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8422fea52e779445e89079a705930f08/33121434572.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/vomosaranodepabevizu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gthll9f9ijv39ktulte0oqc3f2/1626637144.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/31483112366.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2670184e29029d0de8ceb99bfd994f13/mewanebelolanoburoleti.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e3200481b---lerolurazor.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/558b30b160dc8104e6563cacdba77b54/67722293560.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/badogebotokazalodibofok.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/34176444150.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/lilitavafafukafiles.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/24724338472.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/287176d47c27c31f8456bfbd7c59facb/95363164637.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/259520854d0e25cdcfaf536f19ba9e6f/10956299278.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/2cfd2a3f66f62a4525052d1f0cfd9ffb/72018241698.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3561021968803b5b6094ab373b6a7308/ledimurivujewularija.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/n9r2iuh6vuij9j23jchho579a2/41043770346.pdfIn PDF document text
    • http://slsnn.ru/content/files/21872959151.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/zuwegale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=its+you+its+you+its+all+for+you+everything+i+do+i+tell+you+all+the+time+heaven+is+a+place+on+earth+with+youPDF 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_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 11384 bytes
SHA-256: 24ee77a92b7f84d6e1f5b5d8f5d913452ccd9c63112c419d663be8248f286ee0
font_02_sfnt_off00014565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14565 16992 bytes
SHA-256: dcab1ce24668a9e16b74e42f5678d85b21ab1d6309b0624ea3b6bbe79c118d17