Malicious PDF — malware analysis report

Static analysis result for SHA-256 49080bb87bcb350f…

MALICIOUS

PDF

86.1 KB Created: 2021-07-17 00:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57ab8a48888b86ee7e690f379a6ecadb SHA-1: 4aadd0986678c6d6e09013775e1e006f80cf0818 SHA-256: 49080bb87bcb350f187998007d16b66e2c6608a4eec6c8c2099b99df63f010b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/23ae7hvsmhbe95bcq6bgaravt4/19243710045.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/40004415153.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/44160478018.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c988e7e90632961afd94d00a0fc09c0b/4314224314.pdf
    • http://vervesimuhub.com/userfiles/file/pixoziruxaresunapakap.pdf
    • https://addsfly.com/userfiles/file/42046842625.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1295ba453---40412803901.pdf
    • https://ienter.bg/files/ronuf.pdf
    • http://studiotecnicomaglio.it/userfiles/files/penidizerosekupuri.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c832f178---wafasededovuxulijake.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0e153dac7---bexinevunetojur.pdf
    • http://ulrike-mayer.de/userfiles/files/55197809236.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/dc08d286cad3b1e4a6877db6eeaf9c09/37207674099.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf3665d11---84295497124.pdf
    • http://anatolianlgs.com/userfiles/file/74459683990.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/21457779851.pdf
    • http://firegallery.ru/img/upload/47316917901.pdf
    • https://alatheir.com/atheirwsfiles/file/sadutifofoxafi.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e7f14aee---telewoguvakexaf.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/deliwotuvil.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077542913455---40095245396.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160890936a6b63---kudomuwuxivaniwawizov.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/48027957096.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+set+up+a+manual+proxy
    • 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_off0000ef24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 16792 bytes
font_01_sfnt_off0001073b.bin
6ab3d6f32a15ca514711499a72fe34b09ec77648ed7f1769224be445ac153fb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 10712 bytes
font_02_sfnt_off00011fec.bin
65bb1e18a86e3b8f5244bcccdafeb27c8cc3090f671a5c788217a4b4593314c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 16620 bytes