Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd307a1490a466f…

MALICIOUS

PDF

84.9 KB Created: 2021-07-25 06:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 736ff6657ad761bb6e72d2c0283a1db7 SHA-1: 6a08cf8d167dc1b8efbe2a2acc07724731a97e37 SHA-256: bbd307a1490a466f088a05e6687652fe196060f6f33a12e611faad1c96651e9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5adb17bb7---47100252822.pdf
    • https://hotnews.md/upload/userfiles/files/rewekizuxewubunoleva.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609919de05383---guselome.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d2dac449---tajebigakuwem.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718c011b675---76971191394.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a44f9e8a21---79394548357.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/jomubutezojeluguguxomo.pdf
    • https://serwisnawigacji.pl/userfiles/file/54090429357.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0729kl9l4gn8q3kp4rc1tgph8a/sanifitetebopipilozoxa.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/or770c38s05oqh11ist95qopdp/pevezulawepupofiniluv.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c7ec3126a9a946589a92868c73b6dadf/18802241386.pdf
    • http://animalscipublisher.com/files/upfiles/file/64321781630.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/6f086hg9hfrtjdna2intsimg90/xamedurepesutezesawoz.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/benogapetodunov.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be5bcf26802---wemasalupugaponoku.pdf
    • https://hijaulumut.com/contents//files/44433485714.pdf
    • http://jrmhandling.nl/upload/file/38013415331.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4a73a42f504a9c0e8818fbf88c670359/mefolitab.pdf
    • http://aircond.md/upload_fck/file/furawi.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/27a7sneh3obo5e6c5d96anaqn6/mipukibajekurixe.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/69131134624.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dragon+ball+z+tenkaichi+tag+team+2
    • 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_off0000e82d.bin
82ab2efbd24b837a6284f959edaf244f94c1a1c18f4cebc6c720157ea200d975
pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 16900 bytes
font_01_sfnt_off00011478.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 16792 bytes
font_02_sfnt_off00012c8f.bin
862d5981f72928d822d7ff6221d0c5ca543629ad24c8d8dce0bb93e0ae2d6c68
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8F 10920 bytes