Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19802273c9217ea…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 13:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e459a7e05906496c25dc9203777771b6 SHA-1: 2d2272e219cf2d39ef9566ba3e30dc5de41d0c7e SHA-256: b19802273c9217eaad113907870c3f1a754ba5115d1b8f004b8fa5aa490945be
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, several of which point to compromised WordPress installations. One URI specifically uses a raw IP address, indicating a direct attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload via the linked compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studiolorenzino.eu/userfiles/files/zufopane.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cce0e1bfe---62552486497.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607177859a6ba---93471222994.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2a38cc54f1e94fff94ac8defccc6c6c6/lefopizatakuxufe.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9252bb8c---57475163947.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ce4f89436fc56314444575e813436c2d/97757912693.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/8dfhhjk19eg62eq7ajik7354o3/metodukozerima.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16078209539e53---54692849809.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb7e5a487---74023267488.pdf
    • https://bodegoncriollo.com/userfiles/file/senumexora.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b893b9e928b---xozumeju.pdf
    • https://abe-rdc.com/userfiles/file/sawilif.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8560b89fb0---xenabolulamuzilujezuwaro.pdf
    • http://tomaszfilipczak.pl/userfiles/file/wijagug.pdf
    • https://deltagroup.bg/uploads/file/tutukopo.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7nap96gb7ggk9u4a8d6kt9b9uj/84856608235.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858bc1aa1fc---najamagelavadoluvokilusa.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7c81f081---zamurudeworumu.pdf
    • http://alpha-cp.com/userfiles/file/kiborugup.pdf
    • https://novahealthclinic.ca/userfiles/file/jufigoba.pdf
    • http://musclecar-taps.com/js/upload/files/86979326231.pdf
    • http://tanriovermensucat.com/uploads/genel/files/migubopud.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/270fb888d2b56aa582aa63813ea4b0eb/43543870977.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/tebobagawimetedifijub.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708b012f8e8---91611368827.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16083005cde3a6---gepuxopevigifiwa.pdf
    • http://tksvolga.ru/userfiles/file/solifexuzeloj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=congestion+on+m1
    • 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_off0000f5fe.bin
2f6fdb4324538d7a9405e5cd7961080c4c7b227eb79dfd24a61a0b75ca6dff1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 17648 bytes
font_01_sfnt_off00012428.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 16792 bytes
font_02_sfnt_off00013c3f.bin
01b66141be4679ccd6c8a82018caf4a183097abd6f90eaa419e5b317e3332384		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3F 10228 bytes

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