Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7813758a5367a4b…

MALICIOUS

PDF

82.5 KB Created: 2021-06-29 12:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba85319f7ba108e1a6773349febb8b64 SHA-1: d23a688a6bc334ec88e192e790e3f4a2b78d7b99 SHA-256: b7813758a5367a4bbaf5ca13c5dfb943e877ecea411fda37b70da16dfafdb1cd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be to lure users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mazurubezpieczenia.pl/zdjecia/fck/file/99912718836.pdf
    • https://arredamentigiacobbe.it/file/guxoveturijubonutid.pdf
    • https://transport-vehicules.fr/userfiles/file/novuvenowaratasekab.pdf
    • https://ratco-hardware.com/Ups/files/44788616931.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b692ff49bb261c0bdebaf1e17a9f0672/97495722353.pdf
    • https://ph2020.org/FCKeditor/file/66980968094.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/dta96d8k1jvm7jivjv8l8ltd2a/rasawusa.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0a8758cc8b63ca457f20a14b34a1a174/nuzowi.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/b64s6ec6lolhsv4rjm582s6tgt/49406464053.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e60fef83accb8a9e73e0a1db054b0cdf/kogezuxexazexujorabikogi.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3994vnbotj7mecatn22m2rpd32/6989267460.pdf
    • https://torbay.ru/images/uploads/file/5610819512.pdf
    • http://doyen.cc/images/upload/File/16642283741.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/xupeginadif.pdf
    • http://clarksville.net/wysiwygfiles/file/wowusese.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac53854ea---gufonuwobimikagoxibara.pdf
    • http://quickvideo.nl/userfiles/file/54409785398.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/399063caa14524c24bb4776198f05fe6/wijeberogenelosiwirujaw.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099926e660e1---16749476601.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1de18da84---mosaxuwere.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094619c4bddc---fajuratefetenipajigominiv.pdf
    • https://oliogalanis.com/file/sogudanojuginumida.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qbbbvc702aiv9og3aeqpeto0pf/solabizebitikulufanodelat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=genuine+meaning+english
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb7.bin
6269602a4496f16d59d69bd76891b8d46b69f97fb07c15d88f39492152a0271c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 17908 bytes
font_01_sfnt_off00010da4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 16792 bytes
font_02_sfnt_off000125bb.bin
7a96446914810de31a6e383c93216c51693dbe14319953f3a89fd6ab9108ae40
pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 10376 bytes