Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c383b92c8e3c47c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 04:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aeae58b1364d6d3971fb00bf746a4c1d SHA-1: 188ad83f05d96b96cc203ac44eacd1af788e733b SHA-256: 9c383b92c8e3c47cba059a9349b8c05026cd4b0851ed059d2352cb026118c8d1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://tivatijapan.com/uploads/userfiles/file/10692021035.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06df55a26---rulugalo.pdf
    • http://bioident.pl/photos_fck/file/58261017593.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/bd54dfef6b1a2778374f349c1e148051/menatuzejimowezu.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/k1l4ic2nob5gtjsdgcgnv13dfa/55600123880.pdf
    • https://livewireeventz.com/userfiles/file/pidoxa.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8c444095b714d9061ccc77453608534b/netagedulopuj.pdf
    • http://jingluo.net/uploadfiles/files/vujebisusanobujadunuvigi.pdf
    • http://sspvjd.com/FileData/ckfinder/files/20210828_E023DAFBBFF73756.pdf
    • http://st-ark.it/userfiles/files/15639595279.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085d54585d72---feleguxufutiriwiroze.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/40785527017.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/p36gj7us1gchsmv4sm430pusp1/begoditi.pdf
    • http://vestmorecapital.com/images/epost/23758243380.pdf
    • http://angelcabrera.com/FCKfiles/file/67181618030.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3be2aeab75c5fc9c67529d792327e642/xokazuxekadenib.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8864633cb---5139430366.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c842e69b41---98926350525.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/18308012523.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/13401179854.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97618a50f---91671526999.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/n4lmhebfq2n1g2j82rstnl2kt4/jaterugigimupokonakivoxe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lysander+personality+traits
    • 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_off0000d942.bin
454fed027fd52f9efc26707ed6b3f7eb3d6bcefe14625ee496a7f87bd32cd904
pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 17476 bytes
font_01_sfnt_off000106ad.bin
78fb004ec883c9417be163cda6fad23084ca2a53590b93a3d9960d0a18138c7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 10456 bytes
font_02_sfnt_off00011e78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 16792 bytes