Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff67332ac396802…

MALICIOUS

PDF

69.5 KB Created: 2021-09-09 04:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3afe46aec702b760a1ae6b2a3c5cf77d SHA-1: a7f68cc3e7dc97e6aa182db8f44e1e797b1832d4 SHA-256: cff67332ac3968026c17aef8cfc3ac02d7f055340bb4f95a151d55ebf9194cc1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, hosting numerous links to potentially compromised websites or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an intent to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://tubelessons.net/cms_images/file/lijifewife.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130733613bad---wojezuva.pdfIn PDF document text
    • http://hak-al.com/resimler/files/91997486062.pdfIn PDF document text
    • http://specialcats.nl/media/files/39687654445.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/dijivujumivokozem.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/29192849008.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/86465823629.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210904074939.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/gewabute.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/tadolo.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/babuzovusewofife.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/46729302a7365d8c277d4645bf8b5e0d/maragiguwuvamab.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/namafokowemarixopu.pdfIn PDF document text
    • https://istanajp.com/contents/files/bivelikobototu.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/fadij.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161330411277be---51747200507.pdfIn PDF document text
    • http://wmsone.com/eimages/file/penowuvu.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/97734449795.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/sonotoxofeb.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/kuvejo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161306a58860a9---94376574782.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/30133100808.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/zexekafatiwexevoluliwezog.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/20042156380.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4567efb51---fexavewoduzebim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sister+location+android+downloadPDF 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_off0000b25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 14740 bytes
SHA-256: aecf12d529753f1baaf7a01e5537b476a83a3fc5d46943d8494c60a70ea00e19
font_02_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 10524 bytes
SHA-256: 386e3ecfe92c003cc11ec003ef0e82d89990a5310a58f24a6cb5723df7dfa9c3

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