Malicious PDF — malware analysis report

Static analysis result for SHA-256 044373165289cccf…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 13:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: eb83759abe77399970c152e92b2c6bb7 SHA-1: 4dbe58571d5417b7b9a372fdc4c3fbcde0994fa1 SHA-256: 044373165289cccf692946e7f86983013ea6ff13ff86110dea594da474a730cf
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farms hosted on compromised websites, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs point to a pattern of redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/deef6eb341898364ee650d84c07c7a15/31835103665.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160718b3a69441---16783529282.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3b84af59---tebapuxopofudo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af6ae257eb4---xexajotovekovijawimamiv.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d9c034bf03167499b3f39000ce8c768a/79419004644.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/wizomixubirowapekeremav.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/04hcji3ieiaa5ls5glqeu9t9fq/topaxopokasawafomose.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/66468670327.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/60140370314.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/mokopesuvo.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/kezozadutabaxa.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/4291669908.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/tagonuzebawozibubozofod.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210805205736.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/2dkq5s7a2prkojl5vkg5a9bk66/77191678583.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/dalulo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5885829aaec401f7d60a747b2413819a/58331086846.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/429612188.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c998fb03---866200398.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/29801220930.pdfIn PDF document text
    • http://aven.su/userfiles/file/gazilup.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/22776381800.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/godelogilobadepa.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/06b21baa793d8853a0fe23cd331bf1fb/38404197722.pdfIn PDF document text
    • http://flexicourse.cz/res/file/95005642617.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/jesajibogekeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=data+structure+interview+questions+for+5+years+experiencePDF link annotation
    • http://javarevisited.blogspot.comIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 17328 bytes
SHA-256: e82b28aa1199aa5f6ae51d726183d0b36fca8cef473e41e140779708464a479a
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 11176 bytes
SHA-256: 50204248304ec45182740ae43072d0da50542bbb7585c22b7ea0c53d57500485
font_02_sfnt_off000125a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1