Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df67b79ddd0317f…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 16:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6bd5b28907623371e0e6e5c315584b80 SHA-1: 1c8d99823b6932059c0e43026dc58376c7dee9d8 SHA-256: 4df67b79ddd0317fe7387b39b6fbb0817af48a0566f4a4dc63cde0ed54de0df6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, likely intended to host malicious payloads. The 'PDF_RANDOM_URL_LINK' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of distributing malware through these compromised sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file. The document body is unreadable, but the presence of external links and the high confidence ML score suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d866b159ce---72473069550.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/780f6abf7502321a2385c7f0057a94f4/37947690542.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160774eb5d229b---10916111722.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/b19d376ec584cf8eaaeac22e6394c0a3/73030219753.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201f52f89b---14727319001.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/24846839819.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/47467628186.pdfIn PDF document text
    • http://citranco.com/users/files/10459055726.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qeflgmng3fjfd8mvg8hs1l89fp/63283551574.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b8b56c145561d310faff6db2ac810190/kelamaji.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/43751957594.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ivfk74ff1ickki2r9eeubk2ab3/30650128326.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/bozulozakodizuxita.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c931dc0a909885e11ab9a4cf60e3ca69/bikimakebu.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/67041585930.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/wisisegi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b069713b0a3---mafizagafilimaniluzaki.pdfIn PDF document text
    • http://eramaztravel.com/bot/ckfinder/uf/files/fefiwes.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f7c84d459---kotodimufivesofi.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/70697070758.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/93211676571.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2251d00a9ed4ed78b703002b4517665f/denilamezazi.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/15937782767.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/22adbab6254ebe3e586aebe5273b5e9b/kugij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=similar+triangles+problems+and+answersPDF 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_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 11036 bytes
SHA-256: 280f845567f4c2a5689bd5d9f64049add83ceb5807e86114cb479f7042783b72
font_01_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12996 17524 bytes
SHA-256: ab18bd49c043c3d37cab98da1dd0ef1a01d2b49ab95346af9d7c1e41cdee54a3

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