Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fc1ec406941afa…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 00:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 598f19e889cc1e8ac7d01e79aba96b03 SHA-1: 4a08b36a38c24047c172f9a0de1204eea1e9b8ed SHA-256: f1fc1ec406941afa8a8f75c70c8dfd9c6dfe713ccc7b38870896c2f91f27a9e9
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious, classifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, likely intended to redirect users to malicious payloads or phishing sites. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kukubara.com/zdjecia/file/biligomesovuroraxa.pdf In PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/13962780228.pdfIn PDF document text
    • https://chp-travel.ir/data/file/fixodegumaberivaxazanev.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/jowoxodejun.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebf3b5d572---49372280060.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/862uphm8ecvjcusu6tpeqndbsn/75295761964.pdfIn PDF document text
    • http://whatdwellswithin.com/file/8268355785.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b40880cce---80076673809.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607347263c60e---lumopikos.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161206398e5949---pamiporirojegugidofojin.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/96ccbfc0826accc0d95cbddd7d174c0b/45672003166.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/68241897115.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/42652494988.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/66284e0fae12ada10ba04afa3b3812e5/31608995344.pdfIn PDF document text
    • http://bndweb.nl/upload/files/zawesubufimomozovezemi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bf510ba4db336ddab26a12f0aa414a85/gisek.pdfIn PDF document text
    • http://africareview.in/userfiles/file/wutofofore.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b53e6661f---zofepoguz.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fda4ce543fdfaf8f10e48809c26e642a/figiwurux.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5791754da1---mibezuf.pdfIn PDF document text
    • http://vlajamo.cz/images/file/vurewarezelareginokagi.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/67657906315.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/18a858ece6f2f862937ea7c5f18b97c7/49138139579.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161290ed1cc3a8---76047066130.pdfIn PDF document text
    • http://davcpundri.com/css/file/towezozezatem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tnusrb+pc+exam+question+paper+2019+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 21952 bytes
SHA-256: 37248366ba6aa81f6b8baa218094b9c3d15851a9cc23ff2266366bbc3848e7ac
font_01_sfnt_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 11780 bytes
SHA-256: b62e93c6458431f34a1f20de482eb24498b00d19861f57cc539bad8128ca7e43
font_02_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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