Malicious PDF — malware analysis report

Static analysis result for SHA-256 f432752cb99ad6d4…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 06:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 058690c3bcb54ae67569c7dcdf8756a4 SHA-1: fad01ae3c08a303edce69a479a122ce2589605ff SHA-256: f432752cb99ad6d49dfc74403bd21afa2050017412582c85ed0f743994074e33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. This behavior is indicative of a link farm used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://muratay.nl/userfiles/file/wadilojisisatawinis.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a73f026d5---jajisemema.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8d65088c69d4174112549d29e2190eac/xobogisob.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/vefikol.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c30406ff9---26384256589.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/82988753184.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95095ebdbb---6629767427.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/kp9ug00a7igfh6vqod1hthtsf7/bunaxazuti.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/93564213546.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/17714187084.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/df25c9f5a71c23f23172d9c179fae18e/35319048877.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081005706ed8---jusituvitotetana.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/pozosaninadabo.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/nuxuzojubisilitip.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/54624105369.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed601bdd49---daragirubetagoku.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/muwevateferopevuxobofuxez.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a428f742c75---zefedasitojojidofagovito.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050101290373499.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/i6f81uj0mg34kd86hjrb12ime2/wagojatepiliger.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7bfd49cf---92440303392.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/13015591639.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bkhekj7etf0o6ekr7b6j906ovr/pufozixapidus.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20141234ba---7208996137.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/h5ar177d5ab57qav70jj6mco03/93174351605.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/886ad1feb34b6910f769766738a0ffd7/jugasarujitaxejuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mahle+oil+filter+catalogue+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_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 17532 bytes
SHA-256: 46fce85c18043dd7913904664c9bd0d8e9ec3dd92fe638c0b330bc80e7401f86
font_01_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 10720 bytes
SHA-256: 1743d46e83a7c97eb9219d1ec87b2b506797c5108da2513ab3786d94ba8115c4
font_02_sfnt_off0001378b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1