Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad84cc760e4ff9d3…

MALICIOUS

PDF

88.6 KB Created: 2021-07-17 06:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe6f907caffe595f4a57616155c73c68 SHA-1: daa02210bc1e6a34d66c9a658d8b0578fe621411 SHA-256: ad84cc760e4ff9d309085191ed2737dc5287bfbefab36e767dde15c5b00d2bfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wikojasarinutevulexani.pdf
    • http://www.aluvascientific.com/UserFiles/file/rumusizaxugozufuxif.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ql4d8n0rrv9kapmggm7cdom613/xufumelujesefolotip.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cce76e02bee---72095392715.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c2b7a0f1d---42175732069.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d08ebec881f932ca9d0ecef37de485e4/fewofaxa.pdf
    • http://nedirajtebosnu.net/userfiles/file/30335994360.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb3a186ad---31209935103.pdf
    • https://mosallaesf.ir/uploads/ck/files/wumeviliv.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db604f6b53e---tijubosodovikukibowu.pdf
    • https://advance-pack.com/editor_upload/file/4711283683.pdf
    • http://bukharaatlanta.com/sites/default/files/file/3873155386.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vnrk9k2g92s5f5o96el573n2b5/parulegarumivenubexofal.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/88158a32bc41ab928ab9b938bfdb3467/jovevajemo.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098d75be0465---sonozezopakikimirab.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/s37lojgm9f51974a56p8ig2mae/jipixewen.pdf
    • http://anaminfo.com/attachfile/file/lunalitevomukozomamudonuv.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1b750225b4d97158659dc7b13bf20df9/82851793875.pdf
    • https://angkorphotographyguide.com/userfiles/file/15183457100.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b75c6acce7e943e67412e3e54dde6cdd/38349852570.pdf
    • http://flexa.cz/docs/file/biwoxasutoluvodakutib.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cd67b7239---7861961851.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/bfcab5b708e32da86f98b310632e1b47/vevopete.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/qosoba4v9g8vc6l5ri68mv3f4h/bixusisamixasad.pdf
    • http://shannonlakeestates.org/fck_images/file/92747856679.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bloxburg+codes+for+songs
    • 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_off0000f708.bin
0c0286f8a2d5d926f83c62fb7ce7d19dd299b408503165c84abf70c368f834ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 17512 bytes
font_01_sfnt_off00012493.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 16792 bytes
font_02_sfnt_off00013caa.bin
af7b9a5f06e0b6faac856446932917dffe87fbda4c32f7aeebde57e66016064f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAA 10696 bytes