Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6f11db37fd1a18…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 15:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5ef0b61ca620a9a68f66fe4fbc418fa SHA-1: fdd0c77965391ca6346bc010bb6562fb779233d3 SHA-256: 5e6f11db37fd1a185f7a0ca2a4d673ad539f1dd50bb6b877da182d6007ef6623
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef32da3167---34550874547.pdf In PDF document text
    • http://shriadinathbank.com/uploads/patasomujixitojusujotif.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/puxawekoderozivatuguguwo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bada84573---piteba.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/gofadenesowekujag.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/76607327207.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/81948146447.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/37148954572.pdfIn PDF document text
    • http://iknow.pl/files/file/luwarat.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/zafokamanugazo.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/dozubi.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/63311261196.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/fatat.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d8be39cb---81895582467.pdfIn PDF document text
    • http://gr-chem.com/upload/files/45366664404.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/vedim.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/91241748391.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/serirafiliwokuxeveta.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613617e6c6bb5---xokibejidaporub.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/12675499509.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/64bf43fab185f5e4fae82f8849f0bbd1/bokebikuxowimova.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/20834721792.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/71648789978.pdfIn PDF document text
    • http://langmypham.com/luutru/files/39850019891.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/66287756753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+display+2+apps+at+the+same+timePDF 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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 18216 bytes
SHA-256: 768bb31e88016eff206483567576767ba9e634166c4d657c7e997d965df8fb9c
font_02_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 10872 bytes
SHA-256: 7fae8b56b4de23adc5e6c46e616a3d4444b9587c61f79f8bece6bc505376d4d0

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