Malicious PDF — malware analysis report

Static analysis result for SHA-256 4869a51e71a70de5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 12:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25dc2e66c10200c5784f05cca091a273 SHA-1: fbc38e748a2b4fe7ab7a447a06d0d281ef09c871 SHA-256: 4869a51e71a70de58ad55698e9f3fcc63b262b89d55b6d2f131623d57f0ea7e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or IP addresses, suggesting an attempt to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/89c0cc0205eb57b9cf60dfc1d3604712/67306652593.pdf
    • http://mobitransjogja.com/files/62227013354.pdf
    • http://unibox.lv/files/text/sekizifelaselemudekiwobo.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56740dd7d---67514620189.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/4e5jert8guffffp0k13jtvsi21/kixijimevubi.pdf
    • http://auburn-companies.com/userfiles/files/80433862750.pdf
    • https://10glazsikeyrosa.ru/file/ratudixarafobalikowa.pdf
    • https://soudurelauziere.com/upload/editor/file/wulerusaxemije.pdf
    • http://summithighschool1958.com/clients/71652/File/93990269058.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d1da84a95---99553575367.pdf
    • http://libron.pl/fckupload/assets/file/25288230120.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f9161630---jotowowamabufokesewi.pdf
    • http://stalmont.eu/userfiles/file/siwofovilu.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e293820c9---xujogoxobixasokeji.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091a2d29569e---63316694348.pdf
    • http://derma-dts.de/files/file/6308570389.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cebe6720bf---87723152086.pdf
    • https://aldurra.ly/images-editeur/img/file/mizazamimiboxarusokekumu.pdf
    • https://ceccargiurgiu.ro/userfiles/file/vezere.pdf
    • http://157.230.241.115/image/upload/File/xevexetoduxogovuzokawiku.pdf
    • http://minhanh.com/files/fovewuzunekulibejubuzisi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tcp+ip+protocol+suite+third+edition+pdf
    • 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_off0000da73.bin
6341ae7e645490e870de84fc2421fce5b9513d28169470acc5eb1797d6695a91
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 17500 bytes
font_01_sfnt_off00010811.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 16792 bytes
font_02_sfnt_off00012028.bin
83d637959fca77da8edd7c410b10bbfded926db014915163710c8fcb3727ad56
pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 10616 bytes