Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c493ef2f358a92d…

MALICIOUS

PDF

81.9 KB Created: 2021-08-28 19:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 632f1c8a0186bb79e77d518af915f8d7 SHA-1: b70428315525a51fd741a0b3d906647904f5624a SHA-256: 7c493ef2f358a92d15c4025b5b4d2a9e46c1a5332d0281f2636d38da4dfa2068
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://huntic.ru/uplcv?utm_term=48+is+divisible+by PDF link annotation
    • http://itfind.ru/uploads/file/jamekevoje.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/98250306440.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/23115917087.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a59445deebc---lakegibobebaxijijajixab.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/88e18bcdf86c6486aa2d75e507737034/tevipafezipati.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160703e227ef80---72596852791.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/dibukekemuz.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/zexalarusixogaraforameju.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf4e2f7d3---puduzeperutol.pdfIn PDF document text
    • https://patc.fr/imagesfile/8483200121.pdfIn PDF document text
    • http://gibisch.com/files/files/xisagupipirefi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee28c69bb4---vulirisu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/sr32gp9743nbmduf5qsm8foek0/nudexewonusa.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/wavob.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/02caa4a910ded2dab82c0feb451fc302/jadav.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/gaxusawizomagavagutubuzab.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/12865343714.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/82217757064.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/18376134331.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6fb74tjnmf4okj2dg8rjv0n1r4/53995953678.pdfIn PDF document text
    • http://fournitures-reliure.com/prod_files/60485722084.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/sidutefebakutadiku.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/97213447083.pdfIn PDF document text
    • http://keitbg.com/images/files/xixexoxoxitugod.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e99d4472b---bisomumakitutoximader.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095db9e41c52---mawimozabivunovefoxanuw.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3ed197b800061201eab522edf897c722/najofuz.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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 19188 bytes
SHA-256: 1e99e7af4c0639535e70e9c909244ecf589663634605d016548cc2c90bb569a1
font_01_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 10168 bytes
SHA-256: 58360a91af6525d053a125ad40c0c6aa6a1b87f03110facd2d7264a04c7ae13b

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