Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1d0033c2c5b6e6…

MALICIOUS

PDF

85.4 KB Created: 2021-08-11 09:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4adc4560f76c32b80cc9b57476466424 SHA-1: 64df721e3bde26789693516468dbf2da323757db SHA-256: 0a1d0033c2c5b6e65d49326b7ba69e312c47c1500d90eba866255d01443df653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://krisoc.ru/uplcv?utm_term=how+to+install+tux+paint+in+computer PDF link annotation
    • https://autosaloncenter.com/uploads/file/76042802705.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/99467159691.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0897b115---4290236052.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160984b88bc295---duripigoteka.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/749f5f84b738a9486dcf1fc361b90a6b/fujizoj.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/9bio66h79ac3rm01tob31l7dbb/tasarivexifebawad.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/04192d33e1969da27799cdf0e88dc4b9/sedaxiritumitedesu.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/relabujotusononiseloluvuf.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d368be21---vagokudarezesol.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/snhmgf976akqoobgukib52a1no/54261969272.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/nisewuliwa.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/xoxewovumujis.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/kosowodon.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8bba9ee2c---kotasikeketonuvaxatimav.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/11106871522.pdfIn PDF document text
    • http://fruitvita.com/files/files/tulitixevakuzudexujutok.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c78b94654---livijuxekafegijusebuve.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/14af2a70e3186d4fdc8cda47ff181a80/zibag.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd92931bef---438572793.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/907sa6jtvp6oc1jk7b8mttlir0/89617056247.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/l4lohejo4ta0tri6ggc8voj5b4/xexugavuxezemon.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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 17208 bytes
SHA-256: 5aa4a7e115401b47cd2be62bcdefaeb83d7bedaef10165571aded2b825745118
font_02_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 10816 bytes
SHA-256: 2c9a2231d99dae5bd96221de83caeb80ddf63fc0aa4b828fde3627df3ce736a3

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