Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f7567819516d35…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 10:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ead8aee539fb85d92ff02f0594a5ed4 SHA-1: 44d54776c52d6e468b63577c4624bfd3e6056d21 SHA-256: b7f7567819516d357c2007f348318ae79ac13fab391f68078bbaef06259bf625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inijariku.com/ckfinder/userfiles/files/wuwimofevezanu.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/92fc11fa2a775f026040da2b24de92b9/610016832.pdfIn PDF document text
    • http://hmed.vn/upload/files/26737658590.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ef80be8b---73727244611.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/72200188747.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/solenape.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/badodekopafarofut.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0212938l2eqdrcd7gail2jdpub/roxifevikobekuvoxuf.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f3ff79d93---kasozurozugajupej.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/83149684122.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607948085d8b3---64448021111.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/57904867586.pdfIn PDF document text
    • https://master-service.ro/images/file/munafedulenunedaxojek.pdfIn PDF document text
    • https://faprosid.com/file/69027806488.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/81267972577.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/89501596868.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/vujazabosipi.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/nojufafozolewipu.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/niniganamonibi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rhfihktdteh5vvm6c0tko9n19i/77103741926.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6fef6ac08293296b272d8ab8d572c0b3/xuzazoxarevejulorufajinug.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/zutabipobupevajuli.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/96203daa8aef1592f655442a2a73ec47/totopokowupir.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/merijevowulane.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/71880559286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sounds+great+1+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_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 17440 bytes
SHA-256: 5b0ba235b289fd5f1adcc7b638f843ee0e97c6cfb45a645a165a0db6f3088ecd
font_01_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13308 10764 bytes
SHA-256: 7b3057000db354d5ff91c13011f04f90dc4db85e5dede6a88e688c5c7008396b

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