Malicious PDF — malware analysis report

Static analysis result for SHA-256 f371abeb21072cc7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 09:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7ca9fcad9a1d181aff3ffc69e307043 SHA-1: 26df758937adf4f1a7f1e396bd8efd06ff35cb44 SHA-256: f371abeb21072cc711950523053b1ed3149aba24c1002b4e62c120b4b0ec34a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to websites, some hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics suggests an attempt to direct users to potentially harmful content, such as phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=wega+espresso+machine+manual PDF link annotation
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724161d1c6f---fadarabojobesibagan.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/xiraxexakesuwunegifoga.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7198dc6in33evutr4ecsmrl9ql/6188391300.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/47817329931.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1c25eeefc32b3e378dbb8226324337a1/42429580678.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/t5bf48e7i5npc8gpdh5a7ok9b3/gidog.pdfIn PDF document text
    • http://dsagco.com/Upload/file/42460195785.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f04aa516---20577892453.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/26246994086.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/36915285.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/59265138015.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609e38cabc239---dexowi.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/74093576402.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076024a110a8---37814363415.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/e5k8dk1rgepf47n6mbja2da03i/vewuvizikidixizije.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dedd239bc8b---davopunumogimuvelu.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/lomipuxanafinelevaxabon.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/19556478216.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/nrrs1opav01q3fdogh996m1r69/77503571925.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tarine.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/lorixaku.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/tetonazituxatun.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/74204890646.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 10816 bytes
SHA-256: 9a92a327b4b2a37d8aac2c8264e16b66ad4a3903d4cf060b851fe4008ad0d00b
font_01_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 18268 bytes
SHA-256: b3592c112cc569646937270b0a21803db848bbcaf956a0426d14a294adce3f1f
font_02_sfnt_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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