Malicious PDF — malware analysis report

Static analysis result for SHA-256 894526458e3a730b…

MALICIOUS

PDF

87.0 KB Created: 2021-09-08 07:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf8c8167c28b9acfc917ae901a5eddb4 SHA-1: 25182d816aa6c9648254a9d3a044529c8d4fc5c8 SHA-256: 894526458e3a730b9c60b918c339b67cffd101bd2cee5feb2080a556533b5d8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially malicious domains. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa152ded88d---vumiwinamolalel.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd970a3c56---fibalologajaj.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/mategomopebuxofuxafojel.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/1554042457.pdfIn PDF document text
    • https://baglab.pl/galeria/file/99391635447.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/98dfb53fbedd5d984e0169a0c005c3eb/14571958556.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/lewiruzuluvotebevefelewiv.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/kaset.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086070b0eed7---gemupuj.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/bipodegudesopurevudal.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/dowiroga.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63d7cb8f10---sazajafatukowuximenepam.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/28129771897.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/pilatusibiremabiwifinirop.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9adad14dc1323d408c18e8c91c650510/kamadap.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/90759400167.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589080b313---24118212387.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/59353088020.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7d9hvtomksi7lo85rf69cirtae/wufujufomi.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/57273818805.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/52130142905.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/75274637893.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kitazemitiwanukupawani.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kadaxi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5010636506---milajaleke.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/jodoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=outsunny+greenhouse+manualPDF 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_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 10704 bytes
SHA-256: 540e2ea21105f3d16f906db8b805f646398938d13f8cec66b8803d3101453694
font_02_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 18688 bytes
SHA-256: 7e74eb665aadc222647a76638356fa4973d77db523f9b1d8ccbfeacd0ae18ee0