Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddfc3a19f915105…

MALICIOUS

PDF

83.9 KB Created: 2021-07-04 19:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed0557a5a1e217feb3c47973047c5baa SHA-1: 4ead9694fcc736fd0c6fc22746b1389aca165b90 SHA-256: fddfc3a19f9151051d2bdd3ac19675fc684304c8ef1ee2fa1f523c9ef351f77e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content or phishing lures. No scripts were extracted, but the presence of numerous embedded URLs suggests an attempt to redirect the user to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84309bcf60---91415528993.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087700d8433a---goreguve.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b98f2b9de5d51d0196c1fe3c6769cd18/fubozozazotigoxisoxalus.pdf
    • http://malbreil.com/userfiles/file/58432529658.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/05fc81dafc94c7238214c7e5017ee862/nitubir.pdf
    • http://inimtrento.it/userfiles/files/7946984621.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c4e07e8f5---98925822457.pdf
    • https://majorsagilekvaros.hu/uploads/file/bibinerisozewimuvodajajul.pdf
    • https://agronlogistics.com/userfiles/files/vojuw.pdf
    • http://meble-tk.pl/userfiles/file/50148375247.pdf
    • http://hockeydh.com/files/ups/files/47326354139.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c8ef1097---1146110656.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c4521d033c5802149e14419b962eaf6e/94263874771.pdf
    • https://businessservicesuk.com/userfiles/file/74046946155.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7edc6ed44---tadenudilawapaj.pdf
    • http://classtool.info/upload/files/43579463022.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/104c7944c6c0cb024ee9c117943258e8/10523442387.pdf
    • http://macautemple.com/userfiles/file/11726465393.pdf
    • https://alternativecarrepair.com/userfiles/file/55509510990.pdf
    • http://tai-group.com/upload/files/37220429396.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/dda1b4b1c62c0772b2144a60b118d208/jedebijefevofasaborezovem.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/441c3940b2390f1e9b87a7d07e92da9a/zofojotuludevi.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef97d8135---jozozuzezep.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=god+is+over+the+moon
    • 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_off0000e309.bin
043e8a731c883c747d6a6f3f26db8491252de5668671a296179ad56c98de3e5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 10412 bytes
font_01_sfnt_off0000fa7a.bin
40956eaae824a75f2dd0d81aa181625323f7f2e34fc42482a451937f65a04e54
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 18972 bytes
font_02_sfnt_off00012a89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A89 16792 bytes