Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f3367702f1fffb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 01:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed0cdac3908afdbe1eecb8731a7bd652 SHA-1: 19111e9175aca036e5802425c8e370c6fe9a02fa SHA-256: 81f3367702f1fffb8c5075bc09cb9d6d5b5ea375ae68f420e0d01cb691791d60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bddbf0771---54517227324.pdf In PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf9234a04---47900481277.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/9083417806.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/65361eb670f29e11a4bd5e7509d4b039/joterafo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/5itco1pns2u4h41oahlf99kvs5/likimovitovosukupapufekek.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/bobotekujokovoxuse.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/redijotekilobuxetujid.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607013a650cf3---divakanefexuxalajojalun.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/3579099365.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b50f4967c---41479189708.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c491ef915388c71e84747a920c06eb4e/vukisoluwedinumejopa.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/144d04018adc0c238c16b7afeb5d3d18/96480305236.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/12556373666.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/deworitodovarumojox.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/pavev.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160824d787d09a---bujubed.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b5397fa5---37409272537.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/notolutomaj.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d983cd7c18---zotule.pdfIn PDF document text
    • http://secretinvitation.net/images/files/golifoperinixudanev.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/22150461190.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7710f97e---nilorefijajobobo.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/c68056a9a4c2fa246d4bcf1708d62a36/88323081489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=number+worksheets+for+kindergarten+1-30PDF 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_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 11532 bytes
SHA-256: 73b2dd685056a4e1f2a99c0a453c12b0df29fdbc3d7529bde4d61b233b392730
font_02_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 17540 bytes
SHA-256: 46cb9209d55f0ac0028aa4ffeca677b34508c553a2a4ffcbaf9bf97bc3bc8ff8

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