Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e1001ccc567323…

MALICIOUS

PDF

192.0 KB Created: 2021-07-06 00:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22cb979e792c5c7969932e7af79722b9 SHA-1: c4096cc7772e414c5ea8875f824b31b66eee7a66 SHA-256: 33e1001ccc5673230de53fbf84d53b208b099a74a0408f32f36d34cb6cdfc847
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8917

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=watchtower+library+tagalog
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ecu2cc4fn4jshujfrhi3lraq90/jafewefokigu.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/933dff681b2894332dc1f7a97baa5a8c/zomabozejugulut.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160836e807bf17---79209644544.pdf
    • https://olterus.net/contents//files/peposomigo.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984af5e15f9---75664812250.pdf
    • http://accessprecision.com/userfiles/file/fasilarejiberekugud.pdf
    • http://altinay-law.com/images/file/63314952143.pdf
    • https://saatyapi.com/upload/ckfinder/files/patitozemogodafir.pdf
    • http://feach.ie/images/uploads/file/83185398472.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/t0fuh7u3058h8p1r14dq7fou0p/77713407725.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/ligewofaposogofabugixewa.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/1b570348d6fb27566daa63646cf936bc/jaworusolel.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607edbe701db1---gunuvoxabejuxagemesiwi.pdf
    • http://jrmhandling.nl/upload/file/rinekekawevapigufikox.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/n81rv251kolguhrjppabd1ddjo/vikiwilot.pdf
    • http://chronicles.ae/userfiles/files/fediwetosixutavuvej.pdf
    • https://hostessima.pl/userfiles/file/10738683012.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87153da40---robowomevanovipagum.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a73072483fd---25705728993.pdf
    • https://aprilboya.com/userfiles/file/90689776045.pdf
    • https://winpoasia.com/ckfinder/userfiles/files/12537820189.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/34510713376.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fca5229b7---vapatane.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4651daed57d0762943fe9091c5275ddf/13216059143.pdf
    • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00029520.bin
2c7ca34c3f6e0e3e94004fff37b559055b845216bb43ae5d69dfe1d3b1f0ac3b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x29520 32660 bytes
font_00_sfnt_off0001e515.bin
dc04566e0ead3cf033f24fecf2ad706c4e34fcb7dc8be5d0001752899a7c0287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E515 52616 bytes
font_01_sfnt_off0002590d.bin
c22c4d7ac117fa5f2e644b4245cc9fbc52f6b373e0ccfc5e07f81b6a9d77acdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2590D 920 bytes
font_02_sfnt_off00025ff6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25FF6 16792 bytes
font_03_sfnt_off00027803.bin
e9d6efd5370543973569af267302b2035b8acfb18a0e4dc47a889b47d99d0fae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27803 9216 bytes
font_05_sfnt_off0002d734.bin
62e8d35f3e9d1be8d946dcb451ab71785b58073239a6bc80d5778a46418bb21c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D734 10572 bytes

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