Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a27ffe6eed6977…

MALICIOUS

PDF

92.8 KB Created: 2021-07-25 23:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1765b632d4a9eeba810eab393bd3f9bc SHA-1: 7d61453917c0af355900d4e9600879034b2dfaf7 SHA-256: d5a27ffe6eed697737cae669926d791ea4b20719e160ed676ee8103f8fb97f34
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to numerous URLs, some of which are hosted on compromised WordPress sites, increasing the likelihood of users being led to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ipic.vn/userfiles/file/51620759262.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464f13db86---zuvojomorug.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4cffc3ebddb0109d8173767e68ef70fb/kolevuxuzonewowodotuzopum.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/xojikubakadakimov.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/zikewopusizunexatini.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a285c8f3b76---zitetugiloruwasepasatimaz.pdfIn PDF document text
    • http://deauville.ru/files/file/41618533770.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/5095344673.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210724115214938234rtvcz3.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160846ac35bcee---63812071080.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/pdli5ej0fp0vqb9d4prhi5j115/97300560041.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/512c479c03085030c927b1d06042541a/16094091778.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/faxojolamesuf.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076206fbadeb---82963853761.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/59637898315.pdfIn PDF document text
    • https://tcremich.lu/files/files/84827795627.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0bf7bde67d1e9856daa69c0d04317fa/zezuraredawurijugiw.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e73368dcb---43984430565.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/sinikojenese.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kpjcj5ua4178522ss2mccag8mf/buwisoparu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d8dacfcdc59b64aae422c60ce38e34f0/rilakugefusubo.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/mowimib.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b558136cdf3---rivipazefilosuluzudaxate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+a+copper+moonshine+still+at+homePDF 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_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 17384 bytes
SHA-256: d22446e24f4f474085b0144a209a2b9c09d362b5d49484ead72e8396ef0331d1
font_01_sfnt_off000132bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BB 10808 bytes
SHA-256: 0aa0dbd02d2355cda19d6ad320b780696378b5bce27a6914b20edc604b76abcc
font_02_sfnt_off00014b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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