Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc72b94c7c5faac1…

MALICIOUS

PDF

108.9 KB Created: 2021-07-01 10:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e825c7c2a6b7f56a4fb2ac65bc16a9d2 SHA-1: 5ec60cd9941e12d9978fac67e397e20a6d7a9258 SHA-256: fc72b94c7c5faac1d2ecdbb4c22341d5c886d1b272de32bdd62bc2a0b8da460f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://queure.ru/uplcv?utm_term=the+inn+of+lost+time PDF link annotation
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/regaxidirikivufelu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ro8cl220uupmsgf64t82krlbkl/vitipul.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3073c3c5a0---sazixovupon.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/stt3l3iv22ls1vhknpt2fk7t98/87765433246.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4599c2f4c7---64967731845.pdfIn PDF document text
    • http://tfforming.ru/d/files/92382427688.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f0c096313484dc7a98fb5f6ad634f280/malunuwexotusutovu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e18878f875---pilefefanavapa.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/zidekufunoreb.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464e0815e3---26559281261.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/172g5sgulggc98om840lq96sp3/49419440594.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ebb0573cc---femiditowexabatedukeb.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/9musrrdtvouafqp3hodi10qv42/53292054522.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8bce0929e832833f51d4206abb467388/nukotikarewinega.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pobezebiz.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/dilanulekak.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/robofasukipubamivirar.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d114f26d8---65337021016.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/1e53ab4aa6b5464c778dd9c54830a5aa/xijenoto.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/93883605302.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69253175b1---76472125336.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/gedaxekajabefatunowise.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5d3a70c2---13894881761.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9db8858ec8a57d5351f9dbf98815a6b2/94436740068.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 10180 bytes
SHA-256: 88e937e5095ba8490a9f6a1676d995d365e7349df5a5c531cda5a75277638545
font_01_sfnt_off00013320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 14144 bytes
SHA-256: de5674920726794e8020c41b40e644e11ceaca2301d7a3d82444e8c56e5a0828
font_02_sfnt_off00015e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E92 18248 bytes
SHA-256: 160a4eabb19d7d24f688fed82e836bdb0489b73d61ec09b8eeabac09fcbde968
font_03_sfnt_off00018e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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