Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04afb39b16f75df…

MALICIOUS

PDF

91.6 KB Created: 2021-07-06 13:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58f4cea17f1a1acaf95bad51ddafebec SHA-1: 1d2263b928d9f1ec48a045fcdbbce7c6f6e3d47e SHA-256: d04afb39b16f75dfa27ec761e54c71b6e39e7902ff770dac23e55b1611f17d52
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. This behavior is indicative of a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://matchedtubes.de/userfiles/file/71762045266.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf36c747f---67816487379.pdf
    • http://fitviewer.de/files/file/10637739130.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6b757939---lufax.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608680b346683---ravedufiwagegagoxamovu.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29a6bdc461---38940654776.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1b577cf5bc252e9ac91f62759f5cbce5/podajisakugiva.pdf
    • http://tuzvedo.hu/elemek/file/72016331968.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1ece9423---nuzawizuwiwabavoze.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e22f6c0d9f3---63295516536.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d35a680980c21b18ca08434bd5547733/woxiguzojopuvukapobobu.pdf
    • http://beateromer.com/bilder/file/14575428699.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/03cdaf34c96bdee233733f5257dae778/61364743154.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/56892615091.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4hdjkkg1r0m2hrbjb070idd5t4/17006407321.pdf
    • https://faresaldabbous.com/uploads/files/42341907636.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/77373169803.pdf
    • https://stratasphere.online/userfiles/file/91302773856.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tf8mef60s0vh3f9014iqprju10/33470192995.pdf
    • https://abugfreemind.com/userfiles/file/xetik.pdf
    • https://hojoairport.com/images/file/jowijotiwejovomifefu.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/61a309664c336c3f2ebb9b8f44be9bd6/24313572137.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/76191702071.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=calculating+macros+for+weight+loss+and+muscle+gain
    • 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_off000103f0.bin
1f81e621b68dcdb2a0df627d2443dfba3242df097542eaa715fc95630e64bcbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 11140 bytes
font_01_sfnt_off00011da7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 16792 bytes
font_02_sfnt_off000135b9.bin
dc97fab279eff8fd6e49a55d4a649e3d6f75a4ad329ecf5ead0f4c5cf57dd190
pdf-font-stream PDF embedded font (sfnt) at offset 0x135B9 16660 bytes