Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b84125baffe5d5…

MALICIOUS

PDF

76.6 KB Created: 2021-07-10 10:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 065e074f54e3a6b9f8bd714283deb16c SHA-1: 0363614daad7b2c9988661ce404c2dd139d81f8f SHA-256: 29b84125baffe5d570fa81bab699d7a590051cf0c5ee18c32b578818f60125e4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e6368bb9---sivebojokagejakonubefija.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d6b9037a---dasefipuj.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/siniwalutedekagalikosowur.pdf
    • http://31kouqiang.com/userfiles/file/1625861094.pdf
    • https://usssecuritate.ro/userfiles/file/54752402965.pdf
    • http://wallsfamily1912.com/clients/876683/File/devew.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/41c21cbc37685258eca4bb4951d6aa8a/zisavatuxegates.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0p9ne9heib0glu88roce4e427n/silitufekusufix.pdf
    • http://archerelectricsupply.com/userfiles/file/lasevapajalibewis.pdf
    • https://ludifrance.fr/userfiles/file/10573978705.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f03def00f---dekalipago.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9n1sjaiug56bdc8fkmp322pjc5/9366895535.pdf
    • https://corpusbg.com/files/fck/file/gikeb.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6c0740fd8ce094022ecb556bb4b2329c/69123942700.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5724fa02---damikamegefepesi.pdf
    • http://rymwid-training.com/userfiles/file/fabatenadososime.pdf
    • http://alibabashipping.com/userfiles/file/pivewikizugu.pdf
    • https://anthonygillant.com/userfiles/file/jadewogukorawovufi.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/730b36d554eaa90dff1af497c434a0d2/dofixabebiselepow.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095973ddcfe3---digofubibosa.pdf
    • http://arkystudio.eu/userfiles/files/xujejete.pdf
    • https://adasms.fr/userfiles/file/sabigetifodekamuwowudi.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/nizanudofi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=love+conquers+all
    • 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_off0000c67b.bin
02dfdb48f3bcd6c9c4d808cdbb4cfff72993fef22b637e64b481c8c2a2632a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC67B 10304 bytes
font_01_sfnt_off0000ddd5.bin
6a46f5573b18cdb07b6f8ce15d5a979fbd06787fce74c95e400f21ecc26bdfdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 17648 bytes
font_02_sfnt_off00010c13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 16792 bytes