Malicious PDF — malware analysis report

Static analysis result for SHA-256 338a578f78c90385…

MALICIOUS

PDF

94.4 KB Created: 2021-09-08 00:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 549b52d90b4952fd8af67f47217178d1 SHA-1: 2a15f328df88fe6993308b8c415c40b7cc506548 SHA-256: 338a578f78c90385afb3ffe5b37f098f50ba9490b9fd1067c2926faeca7a6b96
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains an embedded JavaScript stream and numerous external links, with several pointing to compromised WordPress upload directories. These links likely serve as a lure for phishing or to download further malicious content, aligning with common PDF-based attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/panifo.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b6c51fa4---80043704453.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/69047881239.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/48510092201.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/zumazoxulewubefogopejela.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/gebusetemanivo.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/12527852638.pdfIn PDF document text
    • http://eventechsite.com/files/files/fegefaravonade.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee37e3e175---73500621160.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/rulekumafak.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/boxefuwuri.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/90837120615.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/42c077c345e1d2f5bdbf9d46257ada83/namadedigazo.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/43683400690.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/81663186001.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/rifiputetibuk.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2e9e0dfa821e195b942bdf06ac67bc73/65693151458.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2971277aa---47528191207.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/1002609501.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/mesigojipodanib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=petronas+annual+report+2015+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 17576 bytes
SHA-256: 1dde38fb3ec8fc79615e34ee0c3a145113bd5c235192625b05207f6b57cdc6a8
font_02_sfnt_off000152b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B3 10928 bytes
SHA-256: 3c9f79cf265d2f2ace98d9e7155a84be904d79d77fe511bd5647f88a3233ceb3

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