Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2813b39c0f358d…

MALICIOUS

PDF

85.2 KB Created: 2021-07-17 13:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d57964c4139efc454c3efdcf4b3100cc SHA-1: 1ba6b1c0dddd4edc82e0cf3d9d45f4b348e09c87 SHA-256: 9e2813b39c0f358dbf912077191a5681d0f99bd3e7bc48d4b6f4b1d7dc0cc578
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. These links likely serve as lures for phishing attacks or to distribute additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://aquatrustfina.com/userfiles/file/lisunudijunemepivimuf.pdf
    • https://muratay.nl/userfiles/file/94293388897.pdf
    • http://alituncer.com/userfiles/file/38103050587.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/79080405496.pdf
    • http://afghansolar.com/userfiles/file/rokejolined.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/8294629534.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/70606399991.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160df7e076cc2e---11424075504.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160838c51be03e---88231164256.pdf
    • https://chmelo.hu/sites/default/files/file/bewibekabigozipaxavugelad.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609409dc52124---20726464918.pdf
    • https://efnnma.org/files/file/35333722715.pdf
    • http://i-dron.cz/data/file/8494898116.pdf
    • http://lapenya.cat/imgjovesnaves/file/nujixefo.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160885c9c4ee21---44299326708.pdf
    • http://finproekt-msk.ru/userfiles/file/85347624492.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/2m9m1qlaghcl73ncfodad1osk8/newajedenija.pdf
    • http://soepcentrale-dekeyser.be/userfiles/file/28260308315.pdf
    • http://sicilyontable.it/userfiles/files/wibiwizobatavubonuva.pdf
    • http://hnspkjx.com/d/files/separogefifenoruzu.pdf
    • http://albino-pitti.com/pub_img/file/levurunivuzuladodizefuka.pdf
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/2484700270.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/72664281088.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+block+spam+messages
    • 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_off0000e993.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 16792 bytes
font_01_sfnt_off000101a5.bin
a5fb1ed9ec0562922ecd22e844adf700ecca8e09805917769c1cc48ae0caac4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 17296 bytes
font_02_sfnt_off00012f0c.bin
81722131506bee23c2dcac510f161b9c6d32d6f9bbf325b661e860eda0a60a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 10732 bytes