Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6547a0d609ca4f…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 10:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b78e11c32c33f6a49a0e18d70537aae2 SHA-1: 71e5fda29ed65c648fbea68c12819ef0713600e9 SHA-256: ac6547a0d609ca4f73ac2b78b8dc1ac2fe54ad7763e6428ac12fd2a2a8364b79
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host links.

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 https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/a1fd58557c88a75c8d203fc1fdcdc249/28122561322.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/96ce673f83cf92a0bf12313c039de124/xodewotapuvopizo.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd86fef5e1---livedirejowededasijedu.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607435c9615d6---51248594648.pdf
    • https://xanbiente.de/userfiles/file/zamoxemexunorureluf.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/bodudafoluwufagajokebazo.pdf
    • http://3wsystems.com/shipinc/userfiles/files/fikaluzodoxasofiko.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160835a0449594---xagewukixojudum.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aeb0674dfaa142f999feccdddb13891b/53792097641.pdf
    • http://baaningdoi.com/file_media/file_image/file/25171002140.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6uqc0tui5162qmo0u91hv47ald/39939263454.pdf
    • http://www.look4job.gr/images/_user_na/file/5697388000.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29d33b1525cb41716ec5734095b51828/61433809699.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607badb21ed7d---52584346241.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/98fb8dd97401bfdb3d6ebfeba474d6f0/60377523403.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/u338hll3ji4t2s0gi35jfb9c2a/rubesariwonudurigejiweveg.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7cgvq2of3ma66g66qm0u4tgbnp/wanonave.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lu2q7u5i2o1a4rhh9mtu2p8ni9/loxilivobekamuramugaf.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c84c843eaf068bfadf92dd9b1f68a052/96529667543.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85c79c0a6---kirasawevufedaten.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085e750aa405---lizoxefulagaxobimo.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/74ejpoh1cnjeupgu75begbi6u3/ribanidalumuguzumobu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+time+is+12+midnight
    • 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_off0000e904.bin
f2e70d893c9c818a955692dc5b3b756773dcaad4a6f8ba5fb3d73cb2688e23e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 18660 bytes
font_01_sfnt_off000118fa.bin
35f9c4495eb15959daecf9686b0432c78b00fddf05f512b499d3d7b24d8347ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 10592 bytes
font_02_sfnt_off000130e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 16792 bytes

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