Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a052f53790a9f2…

MALICIOUS

PDF

106.2 KB Created: 2021-06-27 02:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ceb54a7da248edc378b133cdc285d2e SHA-1: b44c24a77e6e3788bc274d9aaf2761c00c10df6c SHA-256: 51a052f53790a9f20b4dbed26b94427e6e8dbdd7ba59e18784048449c7cddb7e
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it exhibits characteristics of an advance-fee scam lure. It contains numerous links to external PDFs hosted on various websites, many of which appear to be compromised WordPress sites utilizing the formcraft plugin for file uploads. These links likely serve as a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ba2eb494---34219986519.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609509f402c7a---27469927354.pdf
    • https://brod-plovdiv.com/images/25386470792.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa766497344---jivosetesodowojivewa.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/zevaritagepiken.pdf
    • http://supermarketdv.ru/files/file/foxodekajoxuzaroxemesabol.pdf
    • https://adepotcustom.com/UploadFiles/file/20210504110624195.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba783dcf7f4---magelosunumopoxulotediwal.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/70389ca589fa1055cf49eb0a59fee06c/nojakaj.pdf
    • http://jfhcoaching.com/userfiles/files/zuwenagozizovir.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/aekq1c1g77fqpvjskg9lin1icd/91365700780.pdf
    • http://wenxuezj.com/images/File/vikir.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1b9f147eaaa3dfbab5f67b2e7415c242/72831746964.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b561d07bfe0---78070297216.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b035d5847fa---57116474647.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rnumd2k6q2kidk80al5k4sobvu/zakedujunubowigadamaxu.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/28304550208.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/265230c5b7717ea9a81d0129701b2af1/muxebonedurugikugep.pdf
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/tarexa.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/h8s1m9tqpt1s62upuh5a5e80ir/tilivira.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a22bc4d4a4---88885535503.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c16e5869---sibikifaxorakotubas.pdf
    • http://bright-mineral.com/uploadfile/file/2021052011174050.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cheat+exp+pokemon+fire+red
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b48.bin
d523e6106a72bc1e3528b8a84e506da0613b8711a9f5c233284c436ea12758a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 23128 bytes
font_01_sfnt_off0001534e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1534E 16792 bytes
font_02_sfnt_off00016b65.bin
8af913ee0315b1441faa9d63cbf0fefb1cdcb35f3936fa21d97ff4d398373238
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B65 10772 bytes
font_03_sfnt_off00018403.bin
eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
pdf-font-stream PDF embedded font (sfnt) at offset 0x18403 16132 bytes