Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48e4fc76ef311e8…

MALICIOUS

PDF

80.5 KB Created: 2021-08-13 08:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e44dd299c9227eb46156380787467db8 SHA-1: 2f84f71158fadd7b321a9b10687048fc7cf4c020 SHA-256: a48e4fc76ef311e84b66f65b7730c926ac0acddd163462319b222e157c7322d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable due to encoding issues, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/a13162c4b704ed7c82f4300e62cf7ec3/67552319765.pdf In PDF document text
    • https://peterdegendt.be/file/75035033538.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/ruvasuwipuw.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/275bt12cnpl24no4gt9doa5bt6/kisiwajibanovorawofivolaz.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/12186820432.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb325b84b53---vufinelinixeluwigev.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4acc581a1---rakovil.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/12405791721.pdfIn PDF document text
    • http://szpk.hu/_user/file/juvipafekevapivodomes.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/edc24a0068f094200c8a37c00763fb54/rupiwakajuvezaguzeguxexe.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jijixipijodamikemulal.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/58468867936.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/28030bed1b33784c93011106fd572c3c/76407825202.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/lesolavapilajugu.pdfIn PDF document text
    • http://cristalensi.com/public/File/vizibi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161126eac5ccb7---jirurutujomefede.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210716214443.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1620895757.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c883696840---mogediwigiki.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jts0c8drv9716ehuv81jhah5lk/67995952769.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/98172348387.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/92373326868.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a13c3129456---44421403665.pdfIn PDF document text
    • https://kermanrooz.com/img/files/35231806222.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/2i61ahtr629cb9tctulkvaicbc/defagumesepulasofenopu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d9e679158198e4c3c7d55c0ce8649c9d/barobesiruzifavazobimali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fredie+didier+curso+de+direito+processual+civil+volume+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_off0000d1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C1 10872 bytes
SHA-256: 3382e6966e8c481d7a098f9e8d666b84a99f4924ae33ec8affa407facc632d0e
font_01_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 18596 bytes
SHA-256: f6daaeabd38680d190e5a5eaa44f75e2b84a8a6fc7bc4ea856dbc5171df179de