Malicious PDF — malware analysis report

Static analysis result for SHA-256 871e66fb1d024be7…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 03:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b1e037ffc024d2d725bfd6c6f9b5fd5d SHA-1: 97f3852ceac601ae9573480dc28c46108533b0f8 SHA-256: 871e66fb1d024be711bfa190dac6e6aaeb3b4432780239d2138b77b14c1720bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious further supports this assessment. While no scripts were directly extracted, the nature of the embedded URLs suggests a potential for JavaScript execution or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.willmarshelter.com/ckfinder/userfiles/files/13024184690.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f3ae8b1468f9aa6ebbc4870d147d8772/7064569980.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/jexifonadose.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135190c33d80---kelojefojaw.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/juwagawefefuxitonijato.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/jozofevuvukidaligasexav.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613937ccc2f7f---lemozovimatoradevoxog.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/23913732014.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/daliwovefalezaja.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/kenujanuzekozilerofenug.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/50846034166.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/kisalemitezipesoxap.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/falexasawekewofazap.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/rakumiw.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/gurebivogekitozanusejam.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7064d2d12367ff0b1dc832276cd2b73d/20050074405.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/milizuvivunadet.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3afb8d4c---sulimu.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/62797258585.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/75369411597.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/nimedazabemonimofa.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/siweso.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/14323286265.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/bubosanoseboxawivoxejapak.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/gofageku.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/82822086763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=run+apk+on+androidPDF 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_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 17232 bytes
SHA-256: 8d23b134db06528e4c88588507f8c4b97d95286d111db15b7b26a7a154d37faa
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 10180 bytes
SHA-256: 1d29923034c5cf38b2bf8a7d52f6326d1b6e2f8d83f53e7ed44fff523353407e
font_02_sfnt_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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