Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c74c7b35e1f009…

MALICIOUS

PDF

88.9 KB Created: 2021-07-31 00:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e66acad7ee45be4c974d88485b73c5e0 SHA-1: 577188930cdc2763e7171218771d73f3d29c305f SHA-256: f3c74c7b35e1f009f1f767a91bdc7fcdb5e60393ef6c6977c971e5dd2ae1abb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. The presence of a link farm on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=how+to+reset+a+viper+car+alarm+system PDF link annotation
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8743b6d1---81985149734.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q9n12k6th1bv18bt3k5kgenudh/15141726635.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/88463707668.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/93968187505.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/voxirajupulolesosuk.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c27ec2674925edec1c55cfff6f976bf2/mujazeluzotiz.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/53642128758.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7e264c14a642cd307ede2a7adac67fd7/58022983674.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cbvq76i69isje5rb1fd2aunmk0/rububukobalipedavorotazij.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879407eef78---5707863096.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///kobijanisapojebipixi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072e4dff26e7---boxaxiwukizorod.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/giroximegodiwujiwidimu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff20393c4b---49544224100.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/79309557921.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608689bb19bd7---25880606222.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/99469059965.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ac1df4f0---gusemitiwenufu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/km6eeh9gn9vr3s5fb30cdvje6l/boxijelunovajawemoruwo.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/73732755936.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/68532049012.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/42592583139.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_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 17096 bytes
SHA-256: 4f7e67a1f6d11bc03a5c1fab636e4621cccc62fb76c4bd29029cdf87d98925de
font_02_sfnt_off00013d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9F 10688 bytes
SHA-256: 9bc5fda917e14c92ade9bf555ed92412b7ccc8b43fa150228336af4e7e1c0d11

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