Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b9fff0a31916ca…

MALICIOUS

PDF

93.4 KB Created: 2021-07-03 05:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e1991b6f8f0f605f4a50846624bbce3 SHA-1: 42a9682a640a0412e7e229db41af559f8bc56d2c SHA-256: 34b9fff0a31916ca7e4ed1abae462d6dd82ef012cf3df8c3c770c47167825bdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b724a53ac6dd06c394bb5d5ec084992d/78408667460.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ee7973795dc9af739edba3ed5b1d1e22/gitemofazuzudomafamobez.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d26fdd34b23b16e784219c961851cf66/91945614724.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608499e8e8b85---dedigexokadamorunefam.pdf
    • http://polishingmarblefloor.it/userfiles/files/73869430546.pdf
    • http://cartonwrappingmachine.com/userfiles/file/90678805834.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/39683335784.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6efa9e801---kasovamolalerexuxegugew.pdf
    • http://abwfinlay.com/uploads/files/sefazigo.pdf
    • https://kp-bs.ru/upload/files/tuwifanironoduxez.pdf
    • http://apexibd.com/uploads/fck_uploads/file/notixonawokiw.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c13a2de2---79015749848.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/a064eeb65be57b8501d24fd308935a7b/notawogovosunufim.pdf
    • http://jamessham.com/admin/usercontent/file/zalafukumepojeja.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b282a946a57e21146236d34c5c22f0a/jejisif.pdf
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87718728967.pdf
    • https://heyratacademy.ir/file/sosidegirekakutaro.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qelpkrklnggtihm7n40ncauma4/rogovabuxuropunol.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0469c3626---24241329800.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/89e16e9e54a47e8230f98f2339a5959f/xefub.pdf
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/daponaf.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65574f14c---36282450985.pdf
    • https://hagepoorter.be/files/files/42232632101.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=baked+beans+protein+per+100g
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ed.bin
e50bfc7b2c35de9057e3a80225ca04bfd916be2a17be711683773b0f47a3bdfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 17672 bytes
font_01_sfnt_off00011f06.bin
e01c46d86f818ecb457a5276f07ea617322e98231e91e2c3feb3730c6ba6c314
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 10980 bytes
font_02_sfnt_off00013844.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13844 16792 bytes
font_03_sfnt_off00015055.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x15055 16312 bytes