Malicious PDF — malware analysis report

Static analysis result for SHA-256 642fdcea64490f5b…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 20:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: daeff1a9230ea39798b24cf4879e5b57 SHA-1: caac40baa33e434cf295c24a0782c4735e697422 SHA-256: 642fdcea64490f5b3ce970c6b8db9543acd0820f15e7ac1fe338e5a54d8da050
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous unknown URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd03497ffb---geliwifojoxa.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/4jdg043mrhb625op9f1l5i9hmc/9832606733.pdf
    • http://dlmberatung.ch/userfiles/files/werolisowikirotoxenizipi.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/076fa543943b6d14f2647a6dca43c70d/70609501193.pdf
    • https://nepalimodelagency.com/userfiles/file/44612921390.pdf
    • https://akapacha.com/userfiles/file/luwifumaxi.pdf
    • https://rmp-familienanzeigen.de/cms/files/lupitapuwut.pdf
    • http://naturallabs.de/userfiles/file/98277556566.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/0c83c372471badf9e71c629300b3b527/punitifodonow.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b913ea441---luzaxokadanijewupotarapo.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c389eeb622ea21acb63bec564bc32776/90130020650.pdf
    • http://pastoret.it/userfiles/files/60582772083.pdf
    • https://leosservices.com/userfiles/file/dopatepuv.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fabizej.pdf
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/59882151990.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a06d619f2a2---paluwupudelagisobelapofev.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd26cdbe5---nesezujidudipi.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/45mklgi2pouioiqab62l003567/reweruduvewewikuteke.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/xafijidulitinijapevixube.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68b1671a1a---duruduzerurukolovis.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/22ijtgrc1a2mp0cs8i5sp23m38/gumig.pdf
    • http://ttmplus.com/userfiles/files/bebabevodubaze.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4cfa99e43c048ca09b94071ce374a5b6/bebubisuwuvoguwinumimu.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c0245c8cf---rifixazimomig.pdf
    • http://app8itebarandgrill.com/admin/images/file/wuroxebupifa.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160998ba53b086---47125059126.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+number+of+real+solutions
    • 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_off0000f9be.bin
2e3ebf7c1990e35c4b3ad8608fa929988571d46082199f69c68ebd6a14836e5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10712 bytes
font_01_sfnt_off00011221.bin
9b763fe54e1363e893943e145f451597fcbdbc168bced5d236e2ec6426b0d96c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 17608 bytes
font_02_sfnt_off00013fc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC1 16792 bytes