Malicious PDF — malware analysis report

Static analysis result for SHA-256 39543005887a8393…

MALICIOUS

PDF

97.2 KB Created: 2021-07-08 06:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90787ad7b206cbb7ca2972b43d3a84c2 SHA-1: 0c6da5d4f97ff9c8b026bb958325b9837a07a091 SHA-256: 39543005887a83937662fd44dbee329604a61da372f208e0540258a1c6abc3c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/c61b11a4287fb395214eda999c78ef0e/27838191538.pdf
    • http://www.shadowrangers.live/img/files/42055335915.pdf
    • http://goldenpeak.it/userfiles/files/38310756363.pdf
    • http://messtores.ca/fck_user_files/file/66690590250.pdf
    • https://gbagencement.fr/uploads/file/78422036716.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35a63cf30---ragoxukujeguze.pdf
    • https://aedwea.com/upload/foto/77130757813.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/12072881581.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160706604d2f1b---besoduzir.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/29os0uhuvpuke8u3nbbj6436ig/xasagigevavofogivapakoki.pdf
    • https://akproauto.com/nbloom/fckuploads/file/37295492369.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/73b90ed20eabf0ec54b3a742e99d92d6/lawegawa.pdf
    • https://alatheir.com/atheirwsfiles/file/lewogozuzovipikuxebos.pdf
    • http://aliglobshop.com/userfiles/file/kukovilizudobogasilozox.pdf
    • https://bnbcostaverde.it/userfiles/file/55508044839.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/k6jjonsno85hea96re97hjht69/53968815680.pdf
    • http://champagne-marc-chauvet.com/images/files/60137204145.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31c2224cc---14752969313.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d850d0c07b628bb966a6fdedced10292/68021113459.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e572e4482a4---48112713210.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0527f06962b3089ef3b19e3c48382a66/jovekukobufubuxut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gifts+of+the+holy+spirit+song
    • 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_off00011925.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 16792 bytes
font_01_sfnt_off0001313c.bin
1b7a9f5f9c48d1f93b312c95f11182638d5301089835cda1280584b7830758bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313C 10628 bytes
font_02_sfnt_off0001498d.bin
dc6f6836d8558c1a6c0df2c378bb6e1d67d61e340f1e83b1f4bdbeaed027f016
pdf-font-stream PDF embedded font (sfnt) at offset 0x1498D 17892 bytes