Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fbfa0874b4c5cc…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 15:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20889a25095fbff429f68c1454c1e931 SHA-1: e4f4d4643b3ce1209384710e5d666c3fb580fe0e SHA-256: b3fbfa0874b4c5cc393dcc36179efed1cbc00e01b3ad1c1e5fa34e6bea363c35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, potentially for SEO manipulation or to spread malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://lederstuehle-shop.de/ckfinder/userfiles/files/movarinogujo.pdf
    • http://metabolizmusonline.hu/images/upload/file/beropopogafepabadinosipub.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/21246233794.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8bd872f0171d42cc721cf7fe8697548b/62568939021.pdf
    • https://sonntag-immobilien.lu/userfiles/files/84308960562.pdf
    • https://kristinanamaste.eu/files/11626636468.pdf
    • http://debeleven.net/UserFiles/File/gazegugujilekegelupe.pdf
    • http://nanoscopy.ru/uploads/files/24956820372.pdf
    • http://yalcinsezer.com/upload/ckfinder/files/66546003388.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bd3f649e6cfb419a6e3cc6382722d5f7/nejaropokazisexadubug.pdf
    • http://bassbasement.org/userfiles/file/45982809604.pdf
    • https://nffcd.org/userfiles/files/lemunuvevuxivujenamupi.pdf
    • https://777mto.com/contents//files/xudulobodusilokenifonene.pdf
    • http://www.allatpatikapecs.hu/images/file/roxodufamib.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a866cea3fe2---taduvogijuzemetele.pdf
    • https://magicdiscoradio.hu/userfiles/file/tarotanaraluturoxamusu.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2g2nk7ul3cdjs3cqu5idptfj9e/12658048213.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4e325516712b97892b73b85eb71124cb/muposulojorogogijovur.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d7c459e72---resulozufov.pdf
    • http://rcp-ranstadt.us/files/42963869455.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/69071a88c21d66bab9d0289e3678459f/negawe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=inspection+form+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_off0000d098.bin
5a64a482cf74e3088d5efc35c2f5f34a6e7161e919c1aea14739ecbe349b3e4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 10524 bytes
font_01_sfnt_off0000e880.bin
b8ecc7d07b543578e510700dce92ba5c60d03869424a16b690aa4add89a789f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 17692 bytes
font_02_sfnt_off000115f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F1 16792 bytes