Malicious PDF — malware analysis report

Static analysis result for SHA-256 829e18b92b3e0866…

MALICIOUS

PDF

80.9 KB Created: 2021-08-23 10:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 082fa019fccbd75e310e427adc1d1673 SHA-1: e0d9d716e8fb1cb1bdd4111514984cf8bc3cf3fd SHA-256: 829e18b92b3e0866dcebc912103b1af6a249f7bbaa2230ff6f8b7530f26c760f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which host further PDFs. This behavior, combined with ClamAV detection and ML flagging, strongly suggests a phishing or malware distribution scheme. The presence of compromised CMS upload links indicates a technique to host malicious content on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7f606d5c28510ec2fa762f64f2bde69a/27164853996.pdf In PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608699ac95357---leperegafakabisosilir.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/tanagalamabiluwazeko.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2f78ab75b---xasepobatewisefo.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/bujinurojaguzolekowewe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ce470234---69997268106.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/teminaxunir.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/29851605156.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/7p14evnpjm6ac25cdjcb4ordp4/vekon.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/bolivapodupuxirem.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/26847be5b8ee00e429ac1e919f8efc1c/reganudasemuge.pdfIn PDF document text
    • https://funbugs.ie/files/file/53813522950.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/88203058538.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/6807566133.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944cd600d01---tebinudozusutebagiwim.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qp3foah46ehcopt65195v0g4qd/73459565378.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/doeo8fd1qaineh2qfdmvp36fu7/47436789635.pdfIn PDF document text
    • https://highrise.pl/file/90841278430.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3f959b04ba8b43a67ca7b1e03d944fb4/tigakimemapanuromi.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/f88a89b71f3e3cae53df885d94211e4c/wawajivitemajaj.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/todekigemuperuramaka.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6beb0bd159ec278681d258dcf7e45af2/bapidojixudemuludopamof.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/9138763747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=coc+town+hall+6+best+base+copy+linkPDF 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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 11000 bytes
SHA-256: 36d1a625d0a75863a1437bcbb1b457d8663246c2ea01e0f6af0c45d030ad2c04
font_02_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 15952 bytes
SHA-256: 3753fbc64d73e5954bb64e4d5275bf7fd9fa76c12bf72eebddb2d8e96e0beecf

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