Malicious PDF — malware analysis report

Static analysis result for SHA-256 638dd2c55830718a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 23:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a9ceeb210461a418acb6e602823189f SHA-1: 0b0979a598521a31e32c6876da161ab0f8c21ccb SHA-256: 638dd2c55830718ab497bb0aaac34ee6acbce13c434b9dac95e3a079d2b31b7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://kamarkosong.com/contents//files/30893967213.pdf In PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611003f742d14---mejebidufokulopu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607856382b868---retiruwajuwebafonibagi.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/rosusevifozararoziwag.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100a4db57e09---gagidabi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d396db6f44---nemuxekitevuruvinepe.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e070219a9---90491599998.pdfIn PDF document text
    • http://runo34.ru/attachments/file/rozilete.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/53609339355.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/2835860485.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/mc9d1vtjg0d3app864efjtvqa5/78368815055.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7ac37ccb5---62312742530.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2948a5a---maviz.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/popobovon.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/witoxejakepeniwevuxojevu.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/sifilarax.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0dae26ae21d99c5bc3674c8cbca6fc58/49288611372.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/ef1295bccb359f1a2bb5da4ae5e7b50f/86482229081.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983b983bda5---89842798396.pdfIn PDF document text
    • https://cubic.is/userfiles/file/47074205534.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d6b2f145856b9379ee35d3b15c663de9/jovuxawipasutibof.pdfIn PDF document text
    • https://defaico.com/d/files/voniwofe.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/1801496450.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/52197837486.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/bb836192bce764b4ee5afab55cb4a1a3/venomigazalisefaru.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/pigawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bowflex+blaze+home+gym+assembly+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 11024 bytes
SHA-256: d879618b429745f5f5988ad43f5b612c0732d5eb84c107d40797bc2c9f9ccc3e
font_01_sfnt_off0000fc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 16688 bytes
SHA-256: e5616ddca607ae6b646e55f35e72951f8c773e80b40e92110d870cc9e03e925d
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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