Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5fbd5a184b6b70…

MALICIOUS

PDF

76.2 KB Created: 2021-07-06 05:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 021cef25b97ff52094e69b7e7bc9e0db SHA-1: 6110880da00452c5d842f7256892cb08c82a1e1b SHA-256: 4a5fbd5a184b6b70ef72b74ad7a142e4b44f67f7817b40f33440e31b0c61a783
64 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm. The heuristics 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' confirm this behavior. The primary goal appears to be directing users to external sites, potentially for SEO spam or to host malicious payloads, rather than direct exploitation within the PDF itself.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 4

  • 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
  • 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://ahcxdq.com/uploads/file/082205078571.pdf In PDF document text
    • http://goldenpeak.it/userfiles/files/31181109802.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/gilukidenizinabatada.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6855bf584873ffae14fd4973af953213/55509832223.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc4106a4f---migolaforik.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9841ff3f72---4308453160.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0irsjr2j3c36iloq6om99af296/36225652759.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/kilijuwokava.pdfIn PDF document text
    • https://dineflon.com//files/gemewopodelodurosameg.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3gpgbjpjf56et1775tppsug7o4/kanosirewadomutovitotawo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c921b6123---76629479920.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b3473562---96187454273.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/lifdk7p3q3nb2cisqr1ra2n8k5/firuzowemigubul.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ee2c0d66cbdca06c76f53e0dbbc18592/kozigavuvigugipoxixom.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/a403a19ae424ba2b01255b92870e9416/77585996913.pdfIn PDF document text
    • http://foodchemsino.com/d/files/vasivevixavumebusobog.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/424d84fea62ef3c36c9de8fb1e3526fd/pokogatetiwuzujiti.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099411c8ade3---gopiteke.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607852f67e664---67430306768.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/valodanop.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34cee74a---juwadimizitabagan.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7339f791b3c061e9d5a7647d4cfd5043/20923683054.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915da3be2f0---52987933443.pdfIn PDF document text
    • http://teplospectr.ru/images/files/36190369932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=chinese+number+gesturesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 10500 bytes
SHA-256: 37c3a790a977ba30e5570243ddd9781d575d6b98f1a369e5638e2aa4d90f27ef