Malicious PDF — malware analysis report

Static analysis result for SHA-256 de93386ab5176dc8…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 14:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 32ddb45ce5ace6c4d50d624fbaa9143b SHA-1: 1269a446134abd313aa8f084803ac0cc7f607264 SHA-256: de93386ab5176dc860494ac3eab84c80fc347f74ee4c707ee04d8a62bf6a886e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, indicating a likely phishing or malware distribution scheme. The presence of multiple links to disposable hosting and compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/8051d3a033ea7a8ea296f8f42fa3ce8c/44558211087.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80119463d---86127352505.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cae2e4ee3---94343927353.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/zuxulalevuni.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/sofufepamukoropedekidob.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/luwutobuno.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bc7e0421b7a45f6b0100bb5828f70d36/toduzafagavudovulelawut.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/71bd8af53b0b8c6763cad4532bf13be1/63172823916.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/filaxanukusipalezos.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8df4cb17a---dunaxerizepuw.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/lanitapoxufegevo.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/jajarotugojibirisuga.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/jitijigaxusuzojutu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607992da1cca7---pukaso.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/dbfc639b04f5105d6f8fad073818084a/jugovefokewilotukek.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d3fc62ea---fagevavenagepelobevot.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/c2uchi24kmliqbom1etjle2qi1/71634050974.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/q5fhfmot3r0mgcp21ka2s9n6ud/50306610452.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea0ce252f---sokafides.pdfIn PDF document text
    • https://daismene.it/file/tavaxobevukufatumep.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5831da60---82213620895.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160732e1770858---tujuvigawuziwoxin.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/28a2181676cd2efd821b5c67f6697911/tezudewubuzapunenofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=parliamentary+sovereignty+after+brexitPDF link annotation
    • 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_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 17444 bytes
SHA-256: b1cbc0d3b53f804bc25403382c753e6b0a8ccfb02fae2acc06d4c00a7a307b5f
font_02_sfnt_off00014078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14078 10980 bytes
SHA-256: 8f3f3e4b1c02db6160a32b8d74c4360c240efe6ee672d030a94ab974b5e6c784

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