Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a85242396f33f7…

MALICIOUS

PDF

94.7 KB Created: 2021-07-05 05:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a82718684029c6e0d2db95a8c4f07c54 SHA-1: 4a479c0a1e7bae1fa0403f0ead9c5d0a052b8415 SHA-256: 44a85242396f33f78eaa981e375aea128758f5c2291480724bd2a80963623066
126 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised or disposable domains. This structure suggests the document is intended to act as a link farm, likely to distribute phishing content or malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier clean score 0.1461

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://aaaexpressheating.com/userfiles/file/78694850366.pdf In PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af71cf152---42566373493.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/tugodikaperibi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n8j0ffgcrfrrlv868qvnb6ighc/sigigari.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/14909133737.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/7325aa3c326632b06cdad7b4ecbe7277/94517015232.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8180544a96---vurujunonar.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/52e7791124b8a504d2a16fa2da513560/33627555763.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec31a6184---96069799962.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb6440e4e1---nefijusopafolelevavaf.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1f81f927f47b551492174d2e10dd1cd3/korogaz.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/soif7a214a510g9qro6b5a3l9a/belalupamivuduxabakiru.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e19ba47ebec---lupikabedumagodimo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d017c2485d---bituperubodavat.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503192530999296.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/biwimizepasusuzikusosufo.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/dakupupiwavepakulane.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/bn8dac0vgmidn8af2bn4u20b43/64874323312.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ciuveukbe0khif7fmoo7cfjm11/lumiro.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78869abe1d---dasutikiliguvixug.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81db43e5dd---joxuxajit.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff5f950380---negitaputujaleranobiga.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nesuworipoxo.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/16463794649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=blood+oximeter+readingsPDF link annotation
    • 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_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 16976 bytes
SHA-256: 292d1237cada0915aa7feed3e8af0efaf59d595d69ba8ff15bc0ffe0cf96cc19
font_01_sfnt_off00014a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001621a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1621A 10748 bytes
SHA-256: 962d15a088c9e397517236a710e6d243b7465054448df25b3dfab1297a3e0697