Malicious PDF — malware analysis report

Static analysis result for SHA-256 907a3f2fedfb36ea…

MALICIOUS

PDF

91.3 KB Created: 2021-10-08 07:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af29bec477d43844cdf884cd45722ff9 SHA-1: 2dec92e99a1916f7a3c3e892a47ce01754762bd4 SHA-256: 907a3f2fedfb36ea84c1627b7cafaa5b59dafd9d58cfbab876153218e7eb7ab9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e14cc6ecebff60e4be1d244e60b3cdde/gijurinolibojut.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b642d8639d---27039184505.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/naniti.pdf
    • https://leganordavigliana.it/uploads/file/36145282215.pdf
    • https://drivetripper.com/userfiles2020/files/49321730137.pdf
    • http://binhchuachay.info/Images_upload/files/dubimediboze.pdf
    • http://debten.net/UserFiles/File/70138369858.pdf
    • http://meghdoothsuzuki.com/uploads/95036554792.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/sumezokezawebugibo.pdf
    • http://bobmeetin.com/media/galleries/files/75728785998.pdf
    • https://aczv.fr/userfiles/file/vunoruwofezobevezebezebi.pdf
    • http://quaisetoiles.fr/img_pages/file/mutapevigofopudeno.pdf
    • http://www.prctech-th.com/ckfinder/userfiles/files/gekakezoxawikatabisak.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/tipufubinixevurevu.pdf
    • http://2sisaccount.com/userfiles/files/mutudanifusalijukowi.pdf
    • http://dentalcenterstudio.it/userfiles/files/12480524832.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/97dbc9a9ef37d2c853aa7ff5aea3fb99/vixopaxulede.pdf
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/raxojizujuxagin.pdf
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/temalevudaxu.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/7879792159.pdf
    • https://rrhh.fronteraliving.com/imagenes/contenidos/files/dopaxibotuvemifotidijife.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a9587f38d---9975602503.pdf
    • http://www.smwiarus.pl/ckfinder/userfiles/files/19240659733.pdf
    • http://clear-es.net/yamituki-n/uploads/files/rixovosuvupitamub.pdf
    • http://sumisaedu.com/FileData/ckfinder/files/20210911_73EAD1BED05FABCA.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f6a6f5fbbfd32f30d240cfef657b8c17/sawomunajizejebikolijixo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dragon+ball+xenoverse+2+clothing+list+with+pictures
    • 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_off0000f85e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 16792 bytes
font_01_sfnt_off00011070.bin
f38eaa4f78d0f196bb1149ac46e944ce29d7b1053fbcdadb3c0c1347deb40a51
pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 20120 bytes
font_02_sfnt_off000144ae.bin
d45041658b10af16e1d990a4c228cbb8a226bbc9e9c940477178b474175dc036
pdf-font-stream PDF embedded font (sfnt) at offset 0x144AE 11268 bytes