Malicious PDF — malware analysis report

Static analysis result for SHA-256 50445a3a04dc86df…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 09:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cab6569008fae384f01ae1fe864982d8 SHA-1: 83d2f020f2e6969a041e4695674a578879a79cfb SHA-256: 50445a3a04dc86dffdc4bb2883d1981e897255dc0525b3d2f241be966e785f93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this. The PDF itself is heavily obfuscated and lacks readable document body content, making it difficult to determine the exact lure, but the overall structure points to a malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mobiliteit.nu/files/daruleso.pdf In PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6d81981d---bexituteb.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/pufeguviwufaraseni.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/nujujate.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8b1e0b7d---zidetaxebesilatonibap.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b4f873712---91068112500.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210718060354.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/latitajakiro.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/zafufovoz.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/82589880992.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/on79j2htiendkf3bfkpv274ee1/61603666096.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/reliwupasafeve.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/kiwujejamowuwebukinem.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/15577440913.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c984e757---79053050312.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///49200027209.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc9f4189e1---luziwipesapibisifipuro.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/face74ecb3393a3b4f9764b80c5e0390/bejutivoxukesivubowi.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d116f3e7a---22366072856.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b403dcc5c8---10969297410.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/zevamubigomujegefuxevi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612b59157e1cc---zexafexid.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b612ed58858---37887329596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ignou+assignment+first+page+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 10844 bytes
SHA-256: db0a19c195ad749fc1b41b4b2c8d817e51ed2d19ca19a56d7f246067b3e96e1a
font_01_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 17448 bytes
SHA-256: aadcc69f09c72b2e7a66eec0fb3bb96394b5eca228c5a2d8bd8d212a23c344e1
font_02_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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