Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8cc5f5e6a4f4ca…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 12:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cabb2d6441bcc2a6d507d009f3904c08 SHA-1: 1743e101637e316f0d154eee06b8080fc98ae82f SHA-256: ef8cc5f5e6a4f4ca8d91f95980a7086f85cc05a1e0c4425bbc4422d8d560e176
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document designed to trick users into clicking an embedded link. Multiple heuristics point to the document being a link farm hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external URIs, many pointing to potentially compromised sites, supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://roletyhanarol.pl/files/file/65797741462.pdf In PDF document text
    • http://dmkert.hu/files/file/49674834945.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210923070905.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/dazujavewiwije.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/78643540166.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/gijeraguto.pdfIn PDF document text
    • https://anup.bo/images/files/50469597104.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/44628543561.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/42045878290.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe62e9750d---pimevi.pdfIn PDF document text
    • http://crm333.com/documentos/file/42376847841.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210909170744179383ausb5.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/9072925567.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ccfa1986ecf6f5a2696fd4247739e444/34716999615.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/gofogogitexosori.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/wuxusuxexa.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/76463489746.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/rupenaxul.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/sosufonaker.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161325cb40c2de---48641605033.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/xotovoxuberejefisuved.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613188b8ed673---jozutuxoxibadizuboru.pdfIn PDF document text
    • http://rjt1.org/upload/files/dupisage.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/3064354230.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/17545531157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=windows+7+not+recognizing+android+phonePDF 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_off0000b321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB321 14260 bytes
SHA-256: 938ff76f1849abe538cbe15febdc7119f2b0fa5005ca440dc21c5dfd98e1957d
font_01_sfnt_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 10936 bytes
SHA-256: f400a3929fcba040fb0968d9cfcce2272fa877d522f40394ba9add4e210a072a

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