Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb68ecaa513276d9…

MALICIOUS

PDF

92.5 KB Created: 2021-07-13 04:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0c5fb4aaffdbae2c68c13cadf3785eb8 SHA-1: fc5420e3d4001f954dc96e31aab0b3df2eaae772 SHA-256: fb68ecaa513276d9b0e6632f02d2076de46a9c3a9090d938acaef90b01d8e56d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The presence of multiple links on disposable hosting and the ML classifier's high confidence score suggest malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741d6246612---zokufalezawepudevunufe.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19ae87ee5---57649630446.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/248d80073c5ccbe092b0fcde44c597dc/82869576351.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/lodegili.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/lavavuwevakes.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/03ae1aa631fc4d1236ba089f23384380/75489923294.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/xoxiboxozijetuzologo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856841557b3---xujaxibegatinolej.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/44311500442.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/7888831878.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f632ce6c8e9151815e4a5c0fec97a2f3/1576131074.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jopazudopibaw.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/94738416330.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/pavezudefodan.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3bd7afa839c6f68ecac7f0c9e63ab5c9/12853103869.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5s1f8gtj6l2neek9cr9875scvm/zufitikijizo.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/zuxalik.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/25609168837.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/28b4f8ec3dafc7d169756367c35260f6/67467278749.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/dbc4196d877e84db53d9da5f6cf8bce7/49639599409.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c492895eff9---8400762928.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0bb5a7b2a6d3bf767947895e9d8eaef6/60425428168.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/48d76acae95f0d474f01fb4c860c7e88/73888576295.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c908bc9c08---30680391684.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/77790342243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cast+of+the+moon+that+embraces+the+sunPDF 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_off00010740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 10736 bytes
SHA-256: a7a8d9cf8cb323cac4ca413d3adee866736b862c81efeaa1d60ed7fcc32b6ef0
font_01_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 17152 bytes
SHA-256: 03ea90ade7605f76a3151f2f38c7083d87e3a3a07c756d3b45115dd84edda433
font_02_sfnt_off00014c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1