Malicious PDF — malware analysis report

Static analysis result for SHA-256 619732783b50b8d4…

MALICIOUS

PDF

79.4 KB Created: 2021-08-16 10:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9ddd5c1d1501135a2a13734804a28d4 SHA-1: 270f4d3212695cab5246d568ac0767ea11ae66b5 SHA-256: 619732783b50b8d4f3cc9f2b18b9426daab9e0f04af310fa7a31d4e51b838ce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of embedded URLs and the structure of the PDF suggest it is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=mercruiser+6.2+installation+manual PDF link annotation
    • http://aifamilyreunion.com/clients/59202/File/gefolozomikoduzovelako.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/smh3b5p42pon9gogig6ljftrks/fupevomugafobe.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c2135af411a5de11a309af8b8b441f2c/tesosinubalelidemun.pdfIn PDF document text
    • http://creationart.hu/files/file/duxuzumeribekemok.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/49696003567.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/021a622876b5122298c3df0b9fd424b6/xezanefakomerojowag.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835daebabcc---32992316125.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/6797353891.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/66061249823.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/pusukusolerebabati.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/jomemolivezoko.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/93406910868.pdfIn PDF document text
    • http://montesantangelo.it/files/files/5661242668.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/bojajifuvovezeza.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/72m2dkutjmc1hnq9cacr2odol6/rejujujomusas.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/27bq8j216eliigpbj7olen6nc0/jemekem.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19172729e---rikirexoganapot.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d920bbe3dc---47768079098.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/87c49a3ab38bc5bf6d9fff79269a010c/14266663907.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c3a32814820e3d7c56b7083202c6d975/69468590962.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d8ce962afbc5466ba26975fafc5ed425/ditunob.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dd6246eee---dukefigijeka.pdfIn PDF document text
    • https://tavio.ru/files/file/jorusujolafusud.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/dutejadobapasokagetosogu.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_off0000d0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 16896 bytes
SHA-256: fe1c6d3ce0102745063e3048b9a933691dd579b37e7ba0b447953cf0fb6961bb
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 10840 bytes
SHA-256: 90bd63e14fef6a91ae5aea4faf6a6aa7958e7221cc219b546489ea9a231bb4b4
font_02_sfnt_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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