Malicious PDF — malware analysis report

Static analysis result for SHA-256 845871b1cbceba9e…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 01:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f47c6b39d921abbde6b03779e7d3b42 SHA-1: d5e3a2c08356c98b3d7e1f71984c9354155200bb SHA-256: 845871b1cbceba9e7470ec18b575df37cf63fcfafd38384fd99608600224dae9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=hip+hop+smoothies
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160739a6fc2fa2---zulowigilekuwule.pdf
    • https://kurtoglumob.com/upload/file/26218766347.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d8bb14a2---12910036531.pdf
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/goxosexini.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/73p7dubtb3a8rb42pf333ssiu7/56278391841.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e1997eeae414b4d73759594ef93872f5/josalazivosuj.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084227b4d010---40622284904.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5b1d40b1f235f202c399a0828c21528d/waboviroxajonazixakozamum.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/a87kf111l51cijpmpco64buc3s/wototelumobudedavofodib.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b85cd080e6---6272719853.pdf
    • https://delcinfo.ru/img/files/files/299693227.pdf
    • http://cityclick.it/userfiles/files/vibenepurenofowur.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a8c23682dfef3394ea25a1f836871c49/56156338482.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/75525215693.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844d5ed90e2---51139792542.pdf
    • http://www.huntsvillepr.com/files/files/xibipewo.pdf
    • http://sqx.cc/upImgFile/file/20210513175529.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/39r9pccuaq60susr67v2ddavus/nojemitozidudugiw.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/10lsqi5tdvl4k7lfj0lafb56h6/rexumavekiloretot.pdf
    • https://advance-pack.com/editor_upload/file/jemimuloji.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea518e5768---bafikop.pdf
    • http://chinalanpa.com/images/upload/File/jitutixiwevedu.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_off0000f061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 16792 bytes
font_01_sfnt_off00010873.bin
bcfdb8605806fb0b933f87fa2498b8a3953716c1d60e43bba4006dd2bc47c9a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 18704 bytes
font_02_sfnt_off00013897.bin
e64906654f1109cce7a0d1e80cd516ffe7d0796d94645e5148e1afa568859a90
pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 10096 bytes