Malicious PDF — malware analysis report

Static analysis result for SHA-256 b676df584d01613a…

MALICIOUS

PDF

99.0 KB Created: 2021-07-20 22:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a95ecb4ee0dcecb42e344888dbc1b74a SHA-1: 5579ee942552247640454e582c9aa92beca73dca SHA-256: b676df584d01613a384fae82cf507b8f8d38b499a1ae31d0ae3e44bf22245824
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a link farm pointing to compromised WordPress upload directories, suggesting it's used for phishing or distributing further malware. The primary attack pattern involves luring users through these links, likely disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://basyapiemlak.com/yukleme_klasoru/userfiles/file/vezafapojunufofezaro.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740b84dd7f9---naweralowuwikazukoruvinen.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dd228e1269986e80473156a8e03722e/5580238222.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5e17f82c55e234f85171cea47343af7d/8801091427.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7e7d5182---wujikenivuro.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4j5tkg7gkar7dgea9i7jnpqkd8/33386897681.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ouh3j8q91l38j2jr9n0t2f3pqh/jekofoliwafewej.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/4707992300.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10a6b399f4f6d13b7674f4817d9cf84f/naxawosusagowiw.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b4fb1c33---vogiwazipojavixekokaloje.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/kpmmit5ch4eadnpf3ubp5nbqan/pipebufomaxadajowug.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/bujoxogonapeje.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/72937897083.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/26246994086.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/415d165edf4d6878ead6c4377b90ff24/57401670617.pdfIn PDF document text
    • https://angkagenap.com/contents//files/97268666156.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/wobezalozunisixinugadi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/62qr8gvotpq6mi7j94qvptt0m9/32967093066.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5e4f18440a8011c5317547dda867e819/25112123787.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075989dcffb7---46342183904.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c068463d506---26512666126.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/g2av7barotgtcfkoepj33391km/45866187987.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/fb931d2c4a0f9bd8a62b019795543bc6/dizijus.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/6t3qog6jd3hkau6m5jpfgkh1k3/93413179909.pdfIn PDF document text
    • http://splogservice.ru/content/file/65139086845.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210627080146424.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210623032458.pdfIn PDF document text
    • http://praguetransfer.com/files/file/32811190336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=7+day+set+for+lifePDF 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_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 17112 bytes
SHA-256: be320fb81a1855651f846d96dbefa6e98c872f8bfe57db3259a017c1ea3d6ade
font_01_sfnt_off00014f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F15 10312 bytes
SHA-256: e3023d94792616c9767732f1ecf6995e4c35ed4ab82ca9fe9c3447bf3dacc3f7
font_02_sfnt_off0001667e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1667E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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