Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e75a7affd1cde8…

MALICIOUS

PDF

81.3 KB Created: 2021-07-31 12:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1341e735a84d13be79419955d9a052b9 SHA-1: 9a16ae2f5685923f6dd1dc5cc1df54f411e936af SHA-256: e1e75a7affd1cde82148ed44f17e93d6b44beabc53cd733e8edddb461a5f7e74
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal malformed streams and link farms pointing to compromised websites, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a610178df---saxurowoxabifopex.pdf In PDF document text
    • http://ferrocom-spb.ru/userfiles/files/zotefowatemiwamo.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/xonaritumudinuweg.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/lovudibosezira.pdfIn PDF document text
    • http://email-database.info/userfiles/file/timadagej.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c5f42e8083c3f27c1d1bf5394a87e3d5/33100960718.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085922a14488---kivirubar.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/sajomukixumesaleruse.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/gakadotulazigevagejeremu.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/8180333097.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607413309f95b---ramexulabuso.pdfIn PDF document text
    • http://gabortech.com/admin/file/debelisapa.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/136499930960e2fed738203.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/nedasojuj.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/27a0d212816fe7eb4e5a2ea365bf49af/93019869972.pdfIn PDF document text
    • http://msiutilities.biz/documents/repunizotiz.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u83093hf62q2chr104o48i9472/53913327868.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5bng1gm4bq8bvk44tdpo14sr4r/83006374594.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/25236511926.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/botudaduzepiwifaler.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33eadd5ebe---72896807318.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8dc73d356---xotuz.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/59076443893.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/9227688290.pdfIn PDF document text
    • https://birotex.rs/images/files/siwiv.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/riwulugupalis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=stephen+bigalow+t+line+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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 17084 bytes
SHA-256: 57bab5f6a4358ade8b43e2cd584a2e43a3b9746c628edab78aa57936d465f640
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 10808 bytes
SHA-256: 86468cf3dae397d4e1c7cb3e54816c80ee248bf63376d3ea50b2004153893fc1
font_02_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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