Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa65a3659341bb1…

MALICIOUS

PDF

87.1 KB Created: 2021-08-17 04:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c85291762927468fbd227ed3728b6991 SHA-1: 6d31e2c2f6f098a8ffde9b290bdaa736fcd86f3d SHA-256: 4fa65a3659341bb1b645b75f1b4cd5fbf05d9e540640fc05118b0118b149c276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or redirection mechanism. The presence of these links points towards an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allytemp.ru/uplcv?utm_term=adjustment+disorder+with+anxiety+and+depression+va+rating PDF link annotation
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/revrv7rvdvqrcrm1h18u7s7tro/gorej.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/23907463944.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/basogefomidugomezeta.pdfIn PDF document text
    • https://hirurgija.me//files/jepafozikojimizosazime.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/15ea8dc1728b5da8ceeeeb5d13b351dc/90344830088.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/52837576438.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b5aca8691---97653565371.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15580556068.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4eefa1e55f5cb8a1b7b3c0cc5d7568ff/romogijofekoku.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160811d635f91a---95864704064.pdfIn PDF document text
    • https://stotex.rs//files/98642937692.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/gajudomu.pdfIn PDF document text
    • http://xycrusher.com/d/files/71660448367.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/womiwavorosolunit.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/zasotesu.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/vipevobudolupe.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f891ea38148---madazaziwamenamu.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/62713995911.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/247kuakqh1afft2k1vmj5u3ke5/pekif.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/norinimad.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/15804472614.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/uanslnii582a2jranbehtikdn2/81128395186.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/57379511634.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/0h6ofrf784qrmjhil6k12hokge/33295909035.pdfIn PDF document text
    • http://vce34.ru/attachments/file/28919805741.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_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 16724 bytes
SHA-256: ff45d4b77a803fc408cab8e4bd3cc521c539037bf33bd264c4c989556595dfb6
font_02_sfnt_off0001330e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330E 11372 bytes
SHA-256: f587e09fb74e68ee840dd0ef322656f3e8c9bff7429bfa1fc467a496de19d3dc

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