Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0a0ecbc42f7c0b…

MALICIOUS

PDF

97.7 KB Created: 2021-07-13 23:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: eedd56023865a972daa0db36376db39f SHA-1: 0f000c87eedf9e3e99d3daedafbfa9a9972b6e84 SHA-256: 4a0a0ecbc42f7c0bad3afd3fbbd94a6aa9dea8d9ad62e967c0a713a751fba8e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://archism.ru/uplcv?utm_term=how+to+draw+anime+girl+outfits PDF link annotation
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9752b834---xanofulobu.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/1564006977.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/zibaxixoguxizosukenovune.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/nodegasanolodazobajoza.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54aa0dd33---zipetofijalorijafoliv.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/32330144568.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ctuu9o07ukinpptr84p5d68452/15242649392.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ffde2834---rupazapuva.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d0e092fac---nigifudasopezijusixovabal.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/59195038381.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/vufag.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/e737636a712dbb9f665e7c089fe5bea9/soronewufovi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a126b2ece7b---72011116501.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add5f47a739---sotuwoxulatowuforire.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/17223685384.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/c693lbtfs7s7ib1ov9tnsd86q3/lemimevojoxizin.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28dd42ec7---tususopafusajavisovu.pdfIn PDF document text
    • http://masonhn.com/d/files/pegetavetapinetalusuwel.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/49724189932.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160964a1432425---97771387730.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/84800287884.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72e7723ede---707801389.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5aibe4ffnr9laporrqd0drrd0b/jedogabikexozumexa.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/fanuxigodujalevufenemapuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 17360 bytes
SHA-256: f17d8dc29ced0dff2b50e539a2d67151bef9db51776f8c2edfbed0c3e7fff0c5
font_01_sfnt_off00014885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14885 10876 bytes
SHA-256: 6d6a33501e854e6170bd92bd5fa1d13d1fdd797a4cde12bd672b287068d27c31
font_02_sfnt_off0001616d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1616D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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