Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f3893484ff0115…

MALICIOUS

PDF

92.0 KB Created: 2021-06-27 04:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4586462755c2c93db509191bacac2f96 SHA-1: 011e1222fe276a60472822223b5a9417a3ef0db5 SHA-256: b2f3893484ff0115e803b56cc92bb42b3e3c43a72ee6ce46b981a018188c76b6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF containing a link farm hosted on compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of numerous unknown URLs further supports this, as they likely serve as the final destination for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5032d72e6a---wamaxasi.pdf
    • http://staropolski.net/Upload/file/69034148534.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d84b5f6e---rurix.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928f2846b2c---29665552553.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836a44cca0---samosetukekuwusaro.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/3b705209b8b8b6d4be15a5d55dcd1b11/47289756116.pdf
    • https://dietacud.eu/upload/file/keriteminodalawuzalewifaj.pdf
    • http://cnex.cc/images/blog//file/miwefulapapezosuwetubu.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0afec804a---88325218912.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adc39065b01---ninunulegumuw.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/6b759198877d454ae6aeff680fa2a675/68160162785.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/438481c79f374b18010e2364fd419392/59438240176.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86f54a117---57827184043.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073470f64dad---vojuba.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/7464156245.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ee082451---lafagimenukasawaluviwurex.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082b7bc015b4---14773727137.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/m5m5l52ftiq8h2qdk47n1960or/97350274659.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a56e88b1980278a466f45bd51abbd1ad/dolezimatobosodefaguf.pdf
    • http://remont-elektro.eu/archiv/file/momipofepulurobonazo.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a0bab5b8---8062366368.pdf
    • https://poolpoint.be/uploads/file/39246607850.pdf
    • https://prtl.pl/userfiles/file/mekituludijumijotut.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086776e933a5---93655765157.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ea34ngpiq4832299n9ptmrp8v1/fijupozuke.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=use+of+name+tag+in+minecraft
    • 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_off0001035a.bin
7292cbefe86edc71e549b7ef123b7a3e683a7dafa4198495680ead760df8d411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 17284 bytes
font_01_sfnt_off00013078.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 16792 bytes
font_02_sfnt_off0001488f.bin
3de32d38f242659e518d8549e7f63c5fd28376ffd6e5ce1267642456bea57c06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1488F 10640 bytes

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