Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f44cf0705feeb1…

MALICIOUS

PDF

332.4 KB Created: 2021-07-19 05:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c92dc15f60082712cea8c6debc3d4463 SHA-1: 97285573a577e039ee902ce291ee00c3fdd90ae2 SHA-256: 97f44cf0705feeb1c9b8d9db339a4726d5c167a24c865f48fafc83fa1e7ba301
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, acting as a link farm for phishing lures. The high-confidence ML classifier and ClamAV detection indicate malicious intent. The embedded URLs and the nature of the heuristics suggest a phishing attack designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160872f8eec6fd---filokowafozemuxin.pdf In PDF document text
    • http://zatoodesign.com/userfiles/files/18696549128.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071777ed362d---xolaxagisabezevave.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/detinikuvovuforuwebo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a5106d67---29300924225.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/4630178040.pdfIn PDF document text
    • http://carszana.com/image/upload/File/48043224885.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b9821d8f---wabomarop.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d847d4df19898f20e1c0db64c9b2938c/doposamanovuwavosedipawo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe04404ba---getuvifali.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/megapobizibilitude.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/luwutobuno.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/jumazugun.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/rlqbksvt8aenl6slep9h18olah/zunafan.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b376dbb670---zubiloliwonagebe.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a046c25347a---nigagi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d464da80af1---vekakivivujeretowamexador.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087d61bd921f---fexim.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bmkdnp0p4dq22lf19gepnb902v/vezagifaropesufe.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c19f21e3543813a6f8bb43459a1de4de/gewokudetol.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d6384b7ca5e5e1e58f6733e8377985d4/98640982443.pdfIn PDF document text
    • http://ashioke.com/images/library/File/maxefu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/79508954023.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/57752221998.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3953d9a31---timofoxixemafedolagavilex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=from+the+word+principles+make+an+art+inside+each+letter+by+using+the+principles+of+artPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004b97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B97D 21268 bytes
SHA-256: ddc756da799f86bd7f9f75e7db7bfa7bbab6b489d4a07e3b50a25fe41a400bd3
font_01_sfnt_off0004eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000506f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x506F7 11576 bytes
SHA-256: f68acd4a15a86e0003b41f402277e9f922dfe2e076e27257eb6b62706ae76931