Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf6fb0d1c34ec59…

MALICIOUS

PDF

85.6 KB Created: 2021-07-04 14:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2c29225c26957f73816fa475641a7a8 SHA-1: d8d52a5cac008cea39884ce8cae2ddfbd00441bc SHA-256: fcf6fb0d1c34ec59530f3b5b287b837dab47e5f4e78f309edefc1f41f2f21a4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to WordPress sites utilizing the formcraft plugin, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The presence of multiple distinct hosts and the use of UTM parameters indicate an effort to obscure the ultimate destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608005c821214---5007291714.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb4439738---19771048868.pdf
    • http://ndc-group.ru/uploads/files/4529304009.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081389a9c232---vevaduv.pdf
    • http://skogsformedling.se/bilder_umeny/File/vufukagozabefov.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2ec54035---lukipekinomikabexomu.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88068f79e---82789173716.pdf
    • https://vili-al.com/uploads/wysiwyg/files/21161806156.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/4ndaralva5q77lt5s4pav1gtgo/53889411916.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89a9288cc---nolup.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/436243b9478869448995a685425ba478/47194408963.pdf
    • http://fundacionecla.org/resources/original/file/37850607150.pdf
    • http://degrossier.nl/uploads/file/xulokaxarifujoxeja.pdf
    • http://lynhuagiasi.com/Images_upload/files/dovarekokigugefejuzafup.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be49ba0b6---75320779319.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/siqnl5a2kp7bv0ki7dtfqs32s3/lalox.pdf
    • http://gakuso.jp/image/_ckimage_file/bomibagudujevawunumusope.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07a4c86f1---nokujaxotezaxotoloro.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0460a8261e7a64b1a666d49e58c26f24/20691335992.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607955311ca8b---favakatub.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d764d747ed9---58433979268.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a615346f8---devakifedi.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ea2b957e---92745637238.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210525043259.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8243a49fb---26627658023.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=clingy+in+malay
    • 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
stream_005_off0001272d.bin
b6e18635ae2409dbe89f1e3f383999dad02432e0875257d537fab2b389285604
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1272D 19260 bytes
font_00_sfnt_off0000ca9d.bin
12c727dae5ddeda905a6c206b15bd16a4c0c61ba9c6c9406617a9d9e7c4a1f6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 17772 bytes
font_01_sfnt_off0000f91d.bin
da463a6f05b72a72c8a5ea597200219a97f833cc710fcee8d8499071ccfcd2fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 9980 bytes
font_02_sfnt_off00010f1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 16792 bytes