Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c49477c99b6dac…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 12:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29281362d7a6b6bd89479e2d810e93c3 SHA-1: 0bc5f15f28c9cae2414bdb11e91a67fe9294047d SHA-256: e0c49477c99b6dac31577a3ed188591265e882c38b88a3c594ee73a538aa59d4
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm. The PDF contains numerous external URIs pointing to other PDF files, many hosted on disposable domains or potentially compromised CMS uploads. This suggests the document's primary purpose is to lure users into clicking links that likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kompassztuki.pl/Image/files/18222175600.pdf
    • http://mikomisushiwc.com/uploads/files/mazatiluwipijimizasejo.pdf
    • http://npi-management.org/ressource/site-image/files/wujugef.pdf
    • http://ormansagszive.hu/upload/file/sesovuguvadumomorawomajis.pdf
    • http://tensoinox.com/userfiles/files/78474894299.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/guwazov.pdf
    • http://www.depomatrial.com/file/tezokaz.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/60663217557.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613476d129d07---mexevutuk.pdf
    • http://140.121.125.49/ckfinder/userfiles/files/20210910_190723.pdf
    • https://mudraconsultancy.com/uploads/files/58874074500.pdf
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/36752476507.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613446621c0b4---zosumokijisobutigomufig.pdf
    • https://whitesal.com/data/images/file/6800_20210909122809.pdf
    • http://retailcop.ca/files/90591285333.pdf
    • http://lg-palette.com/upload/files/26020576115.pdf
    • https://landtop.com/filespath/files/20210905143433.pdf
    • http://gzcil.com/uploadfile/files/newowanusafugo.pdf
    • http://itexpertdog.nwoasis.com/upload/files/tokuwiwalezejupomufa.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161388c4d1f0e4---48315838411.pdf
    • https://jetaime-shop.com/files/91675299171.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/14617682950.pdf
    • http://gallery4walls.com/upload/editer/file/roredabipunurusivojorune.pdf
    • http://rvhifi.cz/files/file/70667790129.pdf
    • http://gourmethousemacau.com/UploadFilesfile///35659628318.pdf
    • http://tortsurprise.ru/upload/redactor/files/1815075279.pdf
    • http://helenhotel.vn/upload/files/46366202748.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=google+driving+directions+app+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93b.bin
678e9fbfbf773f7d8bede97e2e5f6a0995c951493133381aba5a4bb4a4ddcc60
pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 17980 bytes
font_01_sfnt_off00010776.bin
7db42d5c2035e29255911d3bcfbc82ba978d5fb8edb10fde83c9d0c4812f6fff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 10900 bytes
font_02_sfnt_off000120a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 16792 bytes