Malicious PDF — malware analysis report

Static analysis result for SHA-256 528a7db6e416c3c7…

MALICIOUS

PDF

86.6 KB Created: 2021-08-14 21:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 216f16cb78c34d36ab432125a97567aa SHA-1: 4fbc799e56f8d2843c6353d856ec0217097d8a2d SHA-256: 528a7db6e416c3c75db05e4c579b7e66fe5868b342dd048a8794c059a1cc8db3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://boucherienabli.com/uploads/FCK_files/file/nelarupakibimipepod.pdf In PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/82fd24e50ffa63af9a1780ed20763eb1/denufoponegimiragalexano.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/84033027572.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/nonevumizawonumonupages.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/33bfaba0dc420b253364817dfbad8cff/xiwexixugalefab.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/52842381255.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/15664791126.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/wolurekabewofelanezo.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/957d489baaecdf26f6d97ac92aa22aa4/naluradaputaxe.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/tk4uiq8hhr93aqdrput5qpm96l/dugubad.pdfIn PDF document text
    • http://webbuilders.com/files/file/rutelavijavusiregipofexo.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098bec309aba---baxiteveduwujukadarif.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/wiropotirorikeg.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/wovezigimukimezerurodulo.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/nataratugopodirumisag.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/sekiwose.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076353814308---zetavijidom.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/roneteduwugi.pdfIn PDF document text
    • https://goldenapp.net/file/vozejamivodezoruwufejud.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5tfn4s2dks3p67vgd3iecu9k7f/mapugixuriko.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/moxetagovufomatilo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160704a9186dea---loxunafupidijowezug.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/vebufesosekeropimale.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/88466865481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tokyo+ghoul+manga+vol+1+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 15960 bytes
SHA-256: af44388628b12cad551000be313a3a02e1f4fbae44af1943bca370b2da1c60fe
font_01_sfnt_off00011bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C4 10744 bytes
SHA-256: b4d92931cceb3e92a859385af02c6d3d1cb25f744cb8b1008fed1c5e7d44482e

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