Malicious PDF — malware analysis report

Static analysis result for SHA-256 efca5d4e04bad460…

MALICIOUS

PDF

118.0 KB Created: 2021-08-13 07:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 6266da6087d18f41662392e307283aa1 SHA-1: 016c5aebc56ea43617d9bfe81c1d22be458223fb SHA-256: efca5d4e04bad460f8ae13c4585fa51a8bae0f6d95024f71e215fc5218d0220f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF document that uses brand impersonation (Walmart) to trick users into clicking a malicious link. The link leads to a phishing site hosted on `inwebjor.ru`, which is part of a link farm on compromised or disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing lure designed to harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://inwebjor.ru/uplcv?utm_term=hirdaramani+apparel+annual+report+2019.
  • 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://inwebjor.ru/uplcv?utm_term=hirdaramani+apparel+annual+report+2019 PDF link annotation
    • http://ascensionchina.com/userfiles/file/65412255160.pdfIn PDF document text
    • http://renovator.cz/files/file/72715191272.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/kigewujuzap.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/o11v26mksgb3bjomco0rq246q1/lulafitit.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6992a7f602---lavunupigifizezetisana.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/60ac671fde41fb298a2fb12eb904b34d/16838613755.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1ce523e913c79cdd0f565e4ec9e91615/11330076282.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/jalolelofotaje.pdfIn PDF document text
    • http://metapolar.hu/tmp/momiboroturomatir.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/zowamut.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1ead8e5233071f6efd31848349689dda/62167328813.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aad405f1b---finobofusisefofesubav.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090f040beb44---lolalifotiru.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vavexinilewox.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/71515322779.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/efcf492ed36bec3fffdc196b9c4c79b0/punadimi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/bd93dcc6278ec8f1a198c97c75a5435d/livukogimesoda.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210522185357.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e8fe9ce3a---xidavazisopetevogakudu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/034b9ca785d609dc0d546e7695cbd54b/53641552336.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/92fi3jdee1bgig306sahgk4sl0/97600051720.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f1fe68cdc3b87660decc19a6e70b5f13/24791074383.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743cad5ab0b---63009896583.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001500b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500B 19236 bytes
SHA-256: a95a3a666bba3f2f4bcffe217773a71fddbf8e31c15bdb3d8508e52d423f1d99
font_01_sfnt_off00018280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A97 10936 bytes
SHA-256: 51c664bd0736a84c0c406d035f4042f3e5f2b955b6fd4298d5db10ebde6f8663
font_03_sfnt_off0001b3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3DD 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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