Malicious PDF — malware analysis report

Static analysis result for SHA-256 934f871605102667…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 14:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4776c29d990d662d0f35df30d4a3697a SHA-1: a741349f78262b19bd1b8f28634ac20be2a5b318 SHA-256: 934f87160510266776d957caa80900115d5b7ddb2c1ee16e3d9c746bbcab927c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. While no scripts were directly extracted, the nature of the link farm suggests an attempt to deliver a second-stage payload, possibly via embedded JavaScript or by tricking the user into downloading a file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/heh3d3k22bplo6dmq9kklm0bro/rifoz.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6983c55f7---83693387217.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/84827738543.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fd57aa248---20883533431.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/95003308856.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1c30d133b92f7d3f7a25101858c1c143/biwaxadavedesen.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160af895d44327---51205246653.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/81748109991.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jumaximunerofakifodarof.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4e490c44---17605326244.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/zuzugelowegupurazom.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ftftle19f7pgcnai5e9c5m3nhc/49400451086.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090528a51497---gazoxuguli.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f789792e4c0a214fbb769720aaf2035f/6539643961.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/98245720046.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/fuxatesuvuzisutawozij.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9089733a---34218057325.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/66124376743.pdfIn PDF document text
    • http://devison-matras.com/upload/file/39039886514.pdfIn PDF document text
    • https://altbuket.ru/files/23014205509.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9ba93b167---84902552599.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e7616ceba---fafuligazajifu.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/xotegusebetugisafaxigaxu.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/92151372651.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/15860572104.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/25016264662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=comparative+degree+of+famousPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 10888 bytes
SHA-256: 57b466dc10c18cc7a1d78497b13890616717cc87d84eb2ddd61549e0ef4a08d6
font_01_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 17304 bytes
SHA-256: 855d2f58577a420903fe66f4ca375a1204fb6f968e0c4e91f78b0b55fdbb119e
font_02_sfnt_off000134b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B0 2740 bytes
SHA-256: 4ce2bda54cec3e1e0ec622599ed3082343af332f32613a1ece1739d0d58ddf2a
font_03_sfnt_off00014027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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