Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a59007f4261e06…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 15:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b596c86884c4a3b16bf9abb5e8ff0cf SHA-1: 4354b083c4aba6f96d6500c01b00699664bb86d0 SHA-256: c1a59007f4261e069f41c033f35fddb436faac3c4a53bdeeac0e12924c9543fc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites or download further payloads. The document body is heavily obfuscated and appears to be a screenshot, a common technique to bypass content analysis and trick users into interacting with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 67 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 https://irlanc.ru/uplcv?utm_term=fnaf+free+download+ios PDF link annotation
    • http://pusancard.com/userData/board/file/90722091461.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/kajisatew.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/punasoxijetabalesadenemev.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161463140b4e62---zabop.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/01c7f19d8effc1141db24303a789e1e8/48034489166.pdfIn PDF document text
    • http://fxlcd.com/upload/file/21522126247.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/mofawa.pdfIn PDF document text
    • http://mirgalosh.moscowfashion.net/content/xuploadimages/file/51352531718.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/99978454767.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/ravulusulowi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142086370000---xojifexara.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/vekakamakotixe.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/35445060506.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/53652221314.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/laragoweliwodewa.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/42606843129.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906180251.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/paparenonaludizefija.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/2580961567.pdfIn PDF document text
    • http://artdental.hu/editor_up/wetegikuwe.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/falanejubigopozir.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/pewatukunirijesi.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_off0000afb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CB 14032 bytes
SHA-256: 46183d10be484b1f6641ff6dace68d66f2a5b38d8c03777cb927daa4d0e86a8c
font_02_sfnt_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 10312 bytes
SHA-256: 3b30ffaf87c1da7bc9e3c96ef598bb9a12ef9fc126d65967f1efc84eaeefd882

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