Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f73de3ac7c4370…

MALICIOUS

PDF

92.7 KB Created: 2021-06-27 00:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14fbaebc736b05d3cab14036a4b2c3e8 SHA-1: 40bc9c4b94e324dd281272e352a823bea734d9c6 SHA-256: b9f73de3ac7c4370aa666d5252bdc19564d7dc32a60fd6cb250166cb79901e38
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c932c156bf---ropodazuxewitiwisomeme.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac888842dd0---wofesijigabapukufub.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/292f8a612dcb931106cb1f667bed5b57/jewatodomuwunobife.pdf
    • http://0930actress.com/files/files/bijodoxutaviba.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d52677dd5---vuredujurivotajuripekuvo.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/79694879143.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/5cff024fd18588f78900cfa3170f0610/78772383158.pdf
    • http://edu-family72.ru/content/images/uploads/file/powamutaliduputikorigakot.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f4a9424c---29934679366.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebaf60c42---nudow.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9902a632c4---2917476579.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609f90143a11d---tujewakexalemokis.pdf
    • http://sun-green.be/ckfinder/userfiles/files/tezedorutikumesijokiw.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc06aa410f---lorariku.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3873879dd43eee6f68728dcb0ee9c1a6/daxajux.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740aab92426---luferadudivazobojitaboda.pdf
    • http://dentherapia.hu/files/file/nolixuxuku.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/414028bd3c3f1ecead3637561e766b8e/52767926240.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/wajojugadogulur.pdf
    • http://poltinik.ru/userfiles/file/towekaxulusog.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65cfd17b58---lasiledo.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1a753f727d7aa583d9afab8895044e98/40835953940.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9cf76fd42---zofutofavob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+norton+introduction+to+literature+10th+edition+pdf
    • 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_off000107bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 16792 bytes
font_01_sfnt_off00011fcd.bin
01613e69d773cb0f59f7efc291944a977366321a492cd4d83fa85fda10aacb33
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 17176 bytes
font_02_sfnt_off00014c7b.bin
3838f6d62176bc8bb60e7dd22efc6570d81dba815417bf6f95a24842ef921bb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7B 10784 bytes