Malicious PDF — malware analysis report

Static analysis result for SHA-256 7748ffb42ade304d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 04:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 145ea1e69e35e4fe927198376a73f2db SHA-1: 6df6a1ed415145f1f8adbda9593225802b30d8cb SHA-256: 7748ffb42ade304dcf1671ab72aa3622e00d9f95d843fd115d882228e3ec86e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a second-stage payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=past+participle+rules+pdf PDF link annotation
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc70f27b4---darananefu.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/21714633452.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/fawefaledibefev.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec6a6dddab---vexeb.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/69825765178.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8rsh1p6tdurtupimli8pk79ic7/wozidujaxozozigoz.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c79fe7eb3ab2c0a0ddedd56208af4b10/bonogadasulogovirakodin.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2dcuhlv8ug0fk812lmuq8c2rkg/21531313213.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/20213466088.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/3412003286.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/55113633987.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a118141c7---98197100137.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/legedipuzesibo.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/86207549237.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/78725623470.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/37868582545.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/75244211793.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/romerizezaduxuxuvenofem.pdfIn PDF document text
    • https://quangcaoxetaxi.vn/upload/fck/file/jisitafipowuleboxupitox.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/ziwegolabomikimisizu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb5eea564---rakadonulasuvimew.pdfIn PDF document text
    • https://music-group-store.com/upload/files/39487766393.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6498b06449314f5f5644cdcc61d4ece5/jilusapanivexaj.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_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 10488 bytes
SHA-256: 12b566b65f48ff6b94f53756c536b38c1c8e0701a39d0822bcf012b55587c9eb
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 17872 bytes
SHA-256: 407708b00072e53d9b11b0fce3c75d11b8672b35ad48e4984f4220f06d4f129a
font_02_sfnt_off00011dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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