Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e9378b4cc2414b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 18:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3388ce635bf1cb9db7b265a8be6de5b8 SHA-1: 850e3f50549146e9b839a1ec067cf99142eec7a4 SHA-256: e9e9378b4cc2414ba5bbd85dec55bc9e92ef39eebb807db7980609e4f828b80c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple PDF files hosted on potentially compromised or disposable domains. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://khanaphatgroup.com/UserFiles/file/pebopomolikokawad.pdf
    • https://ludifrance.fr/userfiles/file/damamafolino.pdf
    • https://sunnyrosesschool.com/userfiles/file/toxupezunofawa.pdf
    • http://www.ecostroyservis.ru/File/tumujidijabokipitopub.pdf
    • https://africanresearchcenter.com/userfiles/file/pugogul.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb5cde9aaf---xiwibagasetuzijoxufub.pdf
    • http://homeopathyhongkong.com/files/79579559934.pdf
    • http://francescasciortino.it/userfiles/files/mategomopebuxofuxafojel.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7aa077b37---83884384279.pdf
    • http://amexeuro.com/an3_Uploads/file/95618123260.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608657e4daa42---79911139121.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f2a1530e8a9e89c3f1af9eecda532a37/12776996082.pdf
    • http://aihyang.com/userfiles/file/soxegofofimu.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/257mjdpfam5i0jd9evq7rm70cb/20483190921.pdf
    • https://centrorevisionimonregalese.it/file/tuxoforidixus.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/gatamezel.pdf
    • http://letresorellebio.it/userfiles/files/82263761545.pdf
    • http://www.hussco-steel.com/husscofiles/files/9514801904.pdf
    • http://hflbdq.com/uploads/file/27220232877.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/k9md253dm8l9g45628gqb5b1i5/90615748153.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5kv7r6qqo5dlp4focr6mfa8v7d/togikilaxe.pdf
    • http://yigang-lin.com/uploads/files/202108290007504664.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/24f377b934890d424661a94c83229dd0/95117260268.pdf
    • http://euredit-editions.com/userfiles/file/vukexakovof.pdf
    • http://gleneaglehoa.org/images/file/7575164693.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=renewable+energy+report+2019+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_off0000c67f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 16792 bytes
font_01_sfnt_off0000de91.bin
dfd7edf22eab582c5052f42f8cca7b442d46aa4bfdd9f66f28746f22da919795
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 16324 bytes
font_02_sfnt_off0001089b.bin
739fab64e1f02865876332930f947249a3fc7c8206af3cf3b23ff3e72c92adbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 11260 bytes