Malicious PDF — malware analysis report

Static analysis result for SHA-256 152243e5ec3ee2f1…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 10:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 917bce4bb03585a4b67f07090f39650c SHA-1: 56ff0ce35894066bc02a55cdd8b654cfe30a18db SHA-256: 152243e5ec3ee2f162b9eab850dab8b1fdb26f2d0dd0b0b1b0d9ec83ad11e9f0
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to compromised or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=how+to+add+background+image+android+studio PDF link annotation
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/loximeragunubodoki.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/kaxakotoriwadegezolewib.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/80680507273.pdfIn PDF document text
    • https://maria-galland.ru/files/file/52630801484.pdfIn PDF document text
    • http://ore-processing.ru/d/files/nemux.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/92702591314.pdfIn PDF document text
    • http://klaaswester.nl/img/file/17279285447.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/81787403883.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/sisuripisubare.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_213145.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/34253406440.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/75969227750.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/58865505065.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/zelatamowarif.pdfIn PDF document text
    • http://sun-tes.ru/files/file/37779870511.pdfIn PDF document text
    • http://eternaseguros.net/files/files/kukadesesarodijefasodan.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7fd0d1e51---21008681459.pdfIn PDF document text
    • https://mimpidia.com/contents/files/34035402719.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/vesuzi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613078c15558d---zarajinijapafawoga.pdfIn PDF document text
    • http://ingore.cn/upload/files/gopewanifoluxopamikumi.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/52646293128.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/85237333281.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/genidasavudilulagisowo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8c12bd7ee41bf486e04c1d1680f23c8d/dexetaxode.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/zixelamizisaxanares.pdfIn PDF document text
    • 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_off0000c216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC216 11076 bytes
SHA-256: 72745db64eb223894b97cfb62fdcde7b34737c7b4029b237326559d09b3de3b5
font_01_sfnt_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 17488 bytes
SHA-256: 94a1fc6db90e8c0d3dc745522a2d223b88bb6b00b08319270db361493959e6db
font_02_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1