Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b391989ad7d8f7…

MALICIOUS

PDF

67.0 KB Created: 2021-09-15 11:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12927ae0d808d3b36897664f06aaeda9 SHA-1: 9733d580fe712846d1c98dbd2f95293fc99d5d94 SHA-256: 98b391989ad7d8f7787d882dd676ff866ce727356e2da9f4654f6aaea9806337
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it uses an image-based design with clickable action triggers, likely to obscure malicious links. Numerous URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=harry+potter+hogwarts+mystery+mod+apk+latest+version PDF link annotation
    • http://camel-republic.com/media/userfiles/files/mufekiwozojalub.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/4773216114.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/38i6flnhki0hm5kiuvhbm6t2q1/26327413646.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/xexiko.pdfIn PDF document text
    • https://bursac.net/userfiles/file/27821142476.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/nogowikadomedidarawele.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/euu1iu9esfqmt74bgu57v4gc71/pogilovagolugud.pdfIn PDF document text
    • https://e-room.co/userfiles/file/49002101611.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/tujesudidawatibapezazuze.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/suvokivumajuxin.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/71109577511.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pc3u9ud4hov0n2fsoujqne3tk9/23810777926.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/xokogizafifudonexinaga.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/xatejoxibojojomere.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/46179536564.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/vupenuxopilefujol.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nd2s48kflmdegho83ikh55cdig/matudebivevupawevufap.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/xagavavizinupisetukoposu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614163093afd9---47803402867.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/wamopubozesaviwudisi.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/80747874687.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/zimikikowawomisadif.pdfIn PDF document text
    • https://pecsikult.hu/files/file/pavopizavenofaxo.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/piluw.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/togijivapezemulile.pdfIn 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_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 11188 bytes
SHA-256: 6375bd0d747dd8312022381abf89be362002b33a2cb7473397dd20aaba9d1102
font_01_sfnt_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 14196 bytes
SHA-256: 04273efb75eca851db0c55beead2e779bb7b766ed5b178f3a0b357b280e73f5e
font_02_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1