Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c4bfd4d6b6c2bf…

MALICIOUS

PDF

160.1 KB Created: 2021-06-25 19:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfaeeec6a0eee2276b80e9867110b1dc SHA-1: afbd0351de4b2b699e73eade7d4bea24a70498fc SHA-256: 19c4bfd4d6b6c2bfd83456498eedd00e5573fa0097bdb4e78e391b63c4b5aafa
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to host malicious content, with several URLs pointing to compromised WordPress sites. The presence of 'Fake invoice / payment lure' and 'Callback phishing phone lure' heuristics suggests a phishing attempt. Although no scripts were directly extracted, the overall structure and URL patterns are indicative of a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3d628004aabaa6d3834b9468dd633bd/xupasibasudulatopivib.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5soo0jpnk5g8ptaj173krdk2js/zoxekitarimujenusas.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f5473184c2e63d3162242d21b2fcef3e/59243201170.pdf
    • https://ctapigroup3.com/contents//files/garono.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/vlbiesrnkej9ddsl4q7kaqccv5/varosoluwus.pdf
    • https://clap-bas.com/userfiles/file/renenixojuripepe.pdf
    • http://yomamasushitogo.com/uploads/files/muwiwisa.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f43cc8829cce51499604cdd7dcf8459d/nisuju.pdf
    • http://curry-box-deluxe.de/userfiles/file/70434483190.pdf
    • http://www.wiz-fac.com/uploadImg/file/sedivilenutafafatepomi.pdf
    • http://trendymamy.pl/userfiles/file/94084301860.pdf
    • https://ajitcoatings.com/uploads/bavojukirowebiwi.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qokp2u1lp6kqp690c6elir24c4/75686130062.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f9467e45---dubeg.pdf
    • http://kxnjl.com/userfiles/files/sufisirigujiwefoda.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad264b4bed---35498702421.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3e8215fcbcbb23d021a63f48b7ab0e78/78714016817.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a5a8c60a---13598779250.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/25ebcbd9968fd1f6bb2ad2fe0d37bc72/75973349255.pdf
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bc7b2391---xekilojosugil.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac620bbde6---kuxupukebowobubajapuduseg.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2804bbc1---69378655931.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/a01a22ec9fdd7f792935799483042533/70698747674.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/252c67ad17c1971be99fa300d0e94c88/zejusirelaren.pdf
    • https://antae.be/app/webroot/uploads/file/42090629685.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pain+on+it+band
    • 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_off0001fa16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA16 16792 bytes
font_01_sfnt_off00021228.bin
614e7553e0544ac2e993101b8ba8137bd68da5c51cad17972242f5b4fe6a47ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21228 19440 bytes
font_02_sfnt_off000244ca.bin
5ea8bf6af1c567556827f43195b09bd815f1b34a42d34c790e9934ff52ab89bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x244CA 9936 bytes
font_03_sfnt_off00025ad0.bin
2b6007af9f50235f72656e6179de3641ab0ef0b572ef5cf0cf4b4d7187180be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25AD0 16376 bytes

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