Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7445f7fdfc11c34…

MALICIOUS

PDF

168.1 KB Created: 2021-07-04 03:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06296c24714088d8ca6d34d32c717598 SHA-1: 3324b2804d75fb7d4c95a27e09ebf7c6df938b10 SHA-256: a7445f7fdfc11c342a57144261ab755dc85cfba724a73b04a7a4289d1a028b9c
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple heuristics related to link farms, compromised CMS uploads, and payment redirection lures suggests the document is designed to trick users into downloading malware or providing sensitive information. The embedded URLs point to various domains, some of which appear to be part of a link farm strategy to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 https://crewmak.ru/uplcv?utm_term=3ds+max+learning+book+pdf+free+download
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nezodimadevuses.pdf
    • https://techielingo.com/fck_uploads/files/6687111767.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a892dd1e---bitanaxuzatepagil.pdf
    • http://savvyais.com/userfiles/file/71231779186.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc61b9127e---35439486600.pdf
    • http://folientastaturen.pl/_data/file/jotonuparinegapafolopet.pdf
    • https://airtelco.com/data/users/_/email/files/xalaxata.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0e93bf22e18e9c5692e12d62c1389104/35093506625.pdf
    • https://palcev.ru/userfiles/file/gojivavawizikakinipole.pdf
    • http://afghansolar.com/userfiles/file/59063994395.pdf
    • http://alphasigmaoverseas.com/userfiles/file/waferowumesezudibafig.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/294b6a69cf09b7f87a427a2d01dd4e9d/lutusimerumosoxivo.pdf
    • https://thaiwoodengames.com/files/upload/files/xejeluvukopofupepejab.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a2a66d90---86406702067.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160784a32e8ba6---tofataw.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608b8d12e466d---ledupinefowakinar.pdf
    • https://stiff.pl/ckfinder/userfiles/files/41502402275.pdf
    • http://muzeumostrowiec.pl/obrazy/file/sezojewibanulogisawex.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824a5d8ac97---26641435949.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f17b532c0---soxuxojapojelezi.pdf
    • https://anfauglir.com/images/file/18918260737.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c253d62bc48---daximifisalirunisajogo.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/157ta42l5244b4jtn5h3jnnba9/36972027203.pdf
    • https://mumegram.com/userfiles/file/xixabagedoxetemejatod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022bce.bin
23b61ff86777f66993095baa076322b47fc80ac283d30c49637f0f429909da61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22BCE 11240 bytes
font_01_sfnt_off000245b5.bin
feee0182331cda18c7d94c5d242a87eb8cbdf12515d3375674232b891cd321ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x245B5 20560 bytes
font_02_sfnt_off00027aae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27AAE 16792 bytes

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