Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f36e45de79390d…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 00:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 421ef4cfae64a6e817cfab83f6e90e0c SHA-1: a65e783dee336a2f73571c3752c2c80436e24868 SHA-256: a5f36e45de79390de0f7613d27c514927576773d4182bd9d77dd866ab835a7cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure itself appears to be a link farm, designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://simonhoirup.dk/userfiles/file/87658185459.pdf
    • http://birnagarcollege.in/userfiles/file/kowukavakozini.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/6lseta2cj1gcf8idq3uq7v3je1/46593097393.pdf
    • http://aylincinarli.com/fckfiles/file/5088996684.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j9b5t3ipv51cd4qkt9qvnp65s5/tugokavawuvurus.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160982f6402cc6---82803146252.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607196c389a10---zosejugifumudawevuluxij.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/68140432050.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/wamugus.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/662092c5581815f950137f922d48b013/vojape.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce260801b---81247417084.pdf
    • http://byty-pardubice.eu/UserFiles/File/467394339.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65d328217---14753447666.pdf
    • http://teplolux72.ru/upload/file/46652743237.pdf
    • https://a2designbg.com/userfiles/file/33430715705.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850d5e9a7c6---15152112471.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884ff94369d---66705970912.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b168803a---riwupibivuk.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d91842a95a0730a5f544d51029263849/xogoda.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609842cbc16fa---sibebadozixibin.pdf
    • https://hyosungulf.com/uploads/file/92446341680.pdf
    • https://semut73.com/contents//files/togale.pdf
    • http://alibabashipping.com/userfiles/file/12547898842.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099bded4549e---39420645271.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=repost+instagram+to+story
    • 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_off0000e6d4.bin
6914731d899ad8de9e18d28f5c08056d7f8a5d5f97deaf9a702694ed7a9276ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 10708 bytes
font_01_sfnt_off0000ff73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 16792 bytes
font_02_sfnt_off00011785.bin
fb1cc40cbaa5bf90f77f51acd2e95689339cd75e1bc59fd44fc708abd6f68519
pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 16724 bytes