Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf1cf7f5ef47a91…

MALICIOUS

PDF

93.1 KB Created: 2021-07-31 03:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8ca1240ee3cd1219feaffe6cb9fd23f9 SHA-1: bb4060bd5b5125d3823373b3d3252976673bddcb SHA-256: edf1cf7f5ef47a91946b43ecc57fecd40556c5c590a73906ee686e96400e60a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ural-aiti.ru/admin/ckfinder/userfiles/files/37222756786.pdf In PDF document text
    • http://azizolace.cz/images/file/39367262316.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a88d561429---babofibu.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/53913019882.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/51624567909.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/22405274440.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/sowavunagadigekunol.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/90691956530.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/1498370b3706598682b9723f334ca7ec/bavegijoniruvunesu.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/dijefole.pdfIn PDF document text
    • https://kultmotor.hu/images/files/ligofebumovojalabimemukuf.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/37812497987.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/afbc2218fb2e0db2d43852fbd98bdb64/fodasibasufokefig.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e90d49c36---ledupewos.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/25375988918.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/92803164437.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d11088b8c0f5e3bd657e58a40a109c69/98236235288.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/11870508077.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/n2jtjd80fv8tj0j1palqkcvmsd/mijasa.pdfIn PDF document text
    • http://koala-al.com/d/files/46874431180.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8fb6b34bf---16792775504.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/3hts3gi7871r589uqf388ctuum/38553629753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+care+for+hair+after+botoxPDF 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_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 16608 bytes
SHA-256: 1a7371f03703b7e3162b463b16553a4d3ec2b3a64a149f8d85683ad73c5dc8c3
font_01_sfnt_off000136ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED1 10432 bytes
SHA-256: 9db7c7a15e3ea6eff72f0a6cacc37473ff0b5d21adb334759bbf914b6c19525f

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