Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92acfaac534f0fc…

MALICIOUS

PDF

92.7 KB Created: 2021-08-31 07:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4b044a218b2d3017688dcc38408996cc SHA-1: 1c08db664270ccc33d6ed3841f02d73bc5e1e9ce SHA-256: d92acfaac534f0fc2dcf287c975d8302bce195e72dfd69247b4f3a72810e9c09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://etkindenetim.com/resimler/files/mijuxudiladufesevizomaxej.pdf In PDF document text
    • https://egyiksem.hu/uploads/file/30952557314.pdfIn PDF document text
    • http://vodnik48.ru/content/file/fofofekegiwis.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30991704eb---9682536425.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161129377735bd---63862447926.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/89871798805.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/26683304049.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6ea4e1de264d63c580574732bdecf9da/30322909626.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a056757d121---37277795443.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/mozisidawu.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/katuwudiledob.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611267a7958ec---12438120296.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/42980602230.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ae1be2e5fafd6a10bfec48f3640d7b47/zezotowaravereluvavopi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/72334497052.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098b318ae787---31692302232.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/mbtb5nh3qmg1l5aaglkqg9e7p1/2453699739.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca7edd9896---19192188844.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ae1b40bd---58526255866.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e42ee86c---33666273210.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f87a0fb6---36315112417.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/02d462881231d1790d449c738d82d100/sugoxemoxererobu.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/40579172787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=chocolate+mousse+no+eggsPDF 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_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 10616 bytes
SHA-256: 0f3f2f3ddceb25e125d93d33d0cbe19d85c4dc9b7ec4943055b9abb2849c5904
font_02_sfnt_off00013131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13131 19496 bytes
SHA-256: f0c59bf27bdc009115bbf47cc82b1dcdd540bbfa25222fcff879c95d4916dfb8

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