Malicious PDF — malware analysis report

Static analysis result for SHA-256 7920fe76c40145a2…

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 16:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f3024162bf5606089bab1997d26e12c2 SHA-1: a9c52b82f7e78bae27c57a51c8ca97ce1dff2fe6 SHA-256: 7920fe76c40145a234ab5de8464efda8d497bb83742194e824d8921780c752ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous external URIs pointing to other PDF files hosted on compromised WordPress sites. The presence of multiple links to potentially malicious content suggests an attempt to distribute malware or engage in SEO manipulation. No scripts were extracted, and the document body was unreadable.

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 http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b36c8c213ad---xanijefasemaxumaworujik.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/6dbf9b29260e88727275572b8a06bdfa/jojodadirarawavawotazib.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/508ea39c75262814d11d5fdafd426380/20519763028.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b0d9a1bb38a2326ece4d5bcb1b82f2a2/wivexonepozuro.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/63682092310.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf24a240945---sizovopo.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/db9455e6b52e14112785efff5843a328/rijisafugujimodosefine.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cbcf8ddbc---xabet.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/08a0ec2d49344c66aa70e5d5cd9e7698/lufesimizepavu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46937b2633---kaseduda.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3a35c1ad7ee9cdae33608f29983eacd0/21346181100.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/94779272991.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/33535975038.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/0186dec9144dd6ba2c2d5d430b78791a/pigofezijipigususelugav.pdfIn PDF document text
    • http://valeneighbors.com/userimages/todenajonabodoxe.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/18719606921.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6342391f22---28991113721.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/xutezovilojerotizosagifew.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/7303565abf3290365791431f8affe1dd/bejebadaridenili.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e261a42fa21051b449e4b64650f6a250/83984927318.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe104110b---7768632682.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/q13fjg0929cv32i5n4eqpdo7rb/31509090730.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b47255084973665251ec7fc76af4213c/bezonijumexa.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/987d364847a9c9478770e56ad28a9cf2/21526118817.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/nafhk36to4s3s7l5coisubkr61/kagis.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/vipal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=geometry+calculator+solve+for+xPDF 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_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 19036 bytes
SHA-256: 923caae06979e6645d9cc1b466f2c969cbbb1991112ee4798273b1d9fb09789d
font_02_sfnt_off0001408c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408C 10720 bytes
SHA-256: ba2f229b687fd8dcf7ace870e832c0ee5e6fcf32d780862187154a21eceb3821

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