Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d6340a18f6f278…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 17:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b80e1205c90fb0fa948c0c1be717a171 SHA-1: 34012efde299ee1ed0dbf509b240b44468f11618 SHA-256: 56d6340a18f6f27857e5152340f63f72941a9995bcbf1429fd938ba93c19a15b
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, likely intended to host and distribute a second-stage payload. The PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick users into downloading malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tydafa.com/dafa/uploadfiles/20210907080002.pdf In PDF document text
    • http://straub-online.ch/userfiles/files/44466795669.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/90922236389.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/luminasetapunabofomub.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cba31b49---28784513958.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/telalotorasurolib.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/rusapovewasuxogufi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dl6iug1vi5bb90c802s4q3q2p7/mabuletebaseditexujugoj.pdfIn PDF document text
    • http://asfalon.com/__files/file/65916770611.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/21895015703.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/17485293516134ebd0dcef3.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/8c89e0b534a31d4d6195ea6e5dfaede7/28930784006.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/kilaximaxutapubasonaj.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/10319664386.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/v6k1mg25a4274vg5rmq08o3rr6/7576568323.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/19079730662.pdfIn PDF document text
    • http://holzbau-napetschnig.at/tuwimuromirewabugosel.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613141180b57b---90352018730.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/xamozaxiret.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/56734282300.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/zoxugawufigasosizati.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16306071471281.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/370653961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=thyroid+diet+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_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 18452 bytes
SHA-256: 406fdba76efa407eddaff1cb1f1dc3e7fb33b9837d591457b94597fd770dd388
font_01_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 10192 bytes
SHA-256: b6ab1f1ea1aeeaf54c5951ca3bc5615dc7bd08355a9c93e3811b3c16edf78753

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