Malicious PDF — malware analysis report

Static analysis result for SHA-256 a696791067d0e863…

MALICIOUS

PDF

76.9 KB Created: 2021-09-23 03:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 058db7fe6a4b595d70e4f8094928c08d SHA-1: fe74b222051e1b6e3e313b23f07442b8ce8f7179 SHA-256: a696791067d0e863b7f49dd7a8e060e16b8bd1f40056cc919ebf55d8884035ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://1000projects.ru/upload_picture/file/tukasugevofikugabimob.pdf In PDF document text
    • http://interstroy96.ru/uploads/files/13315215490.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb2ed7190---tejedibibetegex.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/zitegiz.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/62830845047.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/gimafesisaxo.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/fewos.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140978003028---97466039135.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/7764268550.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/53513135093.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cd45ba4a01377123da35dcb305daa82b/6968118863.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/72583911945.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/saxofarexolosagevuduza.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/72944872639.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/92594678422.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/86758640525.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/jitirerumuwilak.pdfIn PDF document text
    • http://insei.eu/userfiles/files/66418887307.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/davevi.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/64194209417.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/99714181548.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/38241263077.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/77630025856.pdfIn PDF document text
    • http://totoumi.jp/upload/file/tapedukufojonizuwatid.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3b395d8ca13cb02d8605d732c056959e/fodusew.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/jopel.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/99767788118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=starting+out+with+c%2B%2B+from+control+structures+to+objects+9th+edition+pdfPDF 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_off0000c49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49B 11768 bytes
SHA-256: 156953da37c154e175739c96ffc958ce1118b825eceade24f8154f9e0041513f
font_01_sfnt_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 16608 bytes
SHA-256: 2430c5cce99d5e96cb15dc2a0fa878fdec58cf0504ca82c4e4e1cd65853169bb

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