Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dcd07d6fba3d0d…

MALICIOUS

PDF

80.7 KB Created: 2021-08-17 16:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95bf48e262044d2bc1e5bdf715444c4c SHA-1: a9cdc574066cce16c062e9c3b8d0849b6645414d SHA-256: b7dcd07d6fba3d0d94b4a9458fa69afa6e5eb28e01313aaa808a69a037a60803
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://nomylo.ru/uplcv?utm_term=how+many+atoms+of+oxygen+are+present+in+one+mole+of+water PDF link annotation
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16072d099669ce---zogewadipiminabevog.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/79500574037.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/82589216894.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/urc66vrdd3kgbhumj41t886n20/62691966327.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/76756300926.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c657d093c1a---nonenuboponetuvivow.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/19405b9b32077d7ff8a2227b1e4b3fc0/17077445742.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/63398700282.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/napuredi.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095d51924197---guveboged.pdfIn PDF document text
    • https://sce.tw/uploads/files/6116ec017d7c1.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/52905978546.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd58b4073---geduzufidipazoragogigewul.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8gc2sdt2j621v47icl4128p9o7/sabulapupoxokutavevo.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3af04fd00---57007342211.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/be1cf15c457fb5ecce2605c7dd68e7fd/mewajupexanizovofenem.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/3088037587.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/1396070034.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/genid.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5394e54ad1---rilatojo.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/luxuraforajarofawokal.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/97948916124.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210626085648_hlfjai.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/rebivezokobovezoripapiku.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086684329375---69047904751.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/poxijovo.pdfIn PDF document text
    • https://red-adlay.com/upload/files/28935419073.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102f1aee6e69---50918871006.pdfIn PDF document text
    • 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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 10992 bytes
SHA-256: 20169730dffb188d8913448185a7c4ac76b56d6b0c9f27b933a4f2a793b59810
font_01_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 16152 bytes
SHA-256: a5ee33c7920f929aeb6266fc6d4c9546c438145ccf49f318914dcf410a55a765
font_02_sfnt_off00011c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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