Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78fde80f6017414…

MALICIOUS

PDF

75.4 KB Created: 2021-09-18 17:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e9ad7d96309313da8eeb07824e72f91 SHA-1: 615b0cfe608c0c5c31423f3aae3ec3626bc25f70 SHA-256: f78fde80f6017414a2a43f995d05e31192dda34264030ef974cad20a88e2993a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple URLs, including those hosted on compromised CMS uploads and disposable hosting, indicates a link farm designed to obscure the ultimate destination or to host further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hiace-yoshikawa.com/js/upload/files/makepuxewoserelod.pdf In PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/jozivukekatep.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/23808436277.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136659f56c88---xegifeloviko.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/xipojomuguxixekekagal.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/kokatosilibalojofimuwun.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/fidiliramebepifivag.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/15939904576.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613509f42de6c---dubigixekexuralodul.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/kugabepirumubon.pdfIn PDF document text
    • http://imaginove.eu/data/Files/xaromime.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://csc0311.com/userfiles/file/20210913130510_wlkx7d.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/xotobepa.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ac7b75b17541441795142fcb2a7089e2/tepofipuleluvozeda.pdfIn PDF document text
    • http://portableandcool.com/files/files/dasogufajovebutesogum.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/43149851555.pdfIn PDF document text
    • http://it-hair.com/userfiles/nagamelepupigefilivedi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c4c95d92caec2ad1ae39c53756706e7c/tanofevilexevededuvurino.pdfIn PDF document text
    • http://creationart.hu/files/file/darutinogunogurilimup.pdfIn PDF document text
    • https://clickbox.ro/images/file/zejed.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/26537662397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cecil+medicine+26th+edition+pdfPDF 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_off0000c340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 10772 bytes
SHA-256: 8bd9f483b82625116498394a4bbbb34974d2aadbd65b1b0d3e84df76b0389920
font_02_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 17044 bytes
SHA-256: 21519808a1279975802f033dde8403c7e584c4dbac7ef24f8b51b6c5501d2f84

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