Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b5ebeac655f4a8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 09:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fbe84e5f830e8a14680d028e87636a58 SHA-1: 8dac56fef30ddf73a8d023f69312c45ddca82648 SHA-256: b7b5ebeac655f4a8ebb23ad05e9590cee160300aa025b5237bea76aad4c911e9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://www.lbtfilm.com/uploads/files/rijutagilaporuwedareler.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3679f6c4ab---38308192919.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc441c0b93---62914953187.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ee18d0b508d187a16225f94e7c92444b/tapovane.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/69575390454.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a433e509ce8026908dcd3c284629585e/78520089940.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/82815607698.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/56e5e31ea863b918834e463f94648f07/91739882243.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/zejikesuwoxoturonizipi.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/40804041610.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613135be4f159---losotoxulikowolukokibijak.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abc28faff25---15821969082.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511c3135ad---dodadilimolanapowewez.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/9146441672.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/rozopiwedoniw.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/60125013484.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/33061053410.pdfIn PDF document text
    • http://szm.hu/userfiles/file/85925344307.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/28eik4gmjosbrdrcqtvlvns6fp/xisidimi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d940fe8e21---86330203397.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/resofulotivifu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072644e358e0---77388185459.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/a4ec0f8284f1dae677c926250fc93089/38233530894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=euripides+hippolytus+summary+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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 10856 bytes
SHA-256: 076e13a519daeb4607a61aaf4d16129368c425907e96e014195975824a202d53
font_01_sfnt_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 19108 bytes
SHA-256: d0ca0e543f550e07dddc35a5938fcbc555df11f04b092f78f4a3bfb7c7463913
font_02_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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