Malicious PDF — malware analysis report

Static analysis result for SHA-256 522978b8d6378773…

MALICIOUS

PDF

91.6 KB Created: 2021-09-07 06:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 267453502b1f4cc773231fcd5fc38730 SHA-1: 1fd66878b33da4492faf22edd5149bd5d503b503 SHA-256: 522978b8d6378773d410e701e670db78aef716afc106c2b2b67d0cf53215c825
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://nexusmediation.nl/files/17584759022.pdf In PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/50100015551.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/zipenosiwepuxafasumu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e2c9dbf563901a4989d2c2012275e66c/moboxuxijaw.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/lolalunodejifibevakamebi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160702ca56e46f---namepaxudepasonawoxo.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/61804142780.pdfIn PDF document text
    • http://lucann.com/Upload/file/66133413807.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100309bdb150---79758003103.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828e05bf64f---kugupogarat.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2fc47175---bozezoguragemekobi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/60810360962.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/zirezuzemitaguru.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210723_7B7B1FB4002A8424.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/36630004843.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/54575717191.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c50b0b7b2---62557200803.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/20262493291.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/losutiloxuzedivofajututi.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/berazotowolifufuvipajif.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/55976908739.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/53594983207.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b8c1083bff775030dd3e6c7fa431f9f7/41930395574.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/71175404695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ursa+mini+pro+g2+user+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000142d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x142D3 18624 bytes
SHA-256: e89ae16df0cfe0e0fac2c2fb27f7eb99d7a8083b950d43aa4a7dda57a60d1bed
font_00_sfnt_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 18096 bytes
SHA-256: 19f9d4d38237f97201bdfa3b71f6f2fdc09ce3223fc3ddfa8809ba4ec24a3d9d
font_01_sfnt_off00011220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 10724 bytes
SHA-256: 8461dd0699f96199a527754dbe9590e257b64c95e7526002a0d41c6482165f66

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