Malicious PDF — malware analysis report

Static analysis result for SHA-256 2112077372e83ec3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 19:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26ce7c86b81bed4d30d2fcc9655de0cb SHA-1: 0cd5b96c54ba3e1e22676b6974da6c9892c638f3 SHA-256: 2112077372e83ec396eb06f85f9c5d4c16e47cd654b838429f729eebb035e43e
196 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. Heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic strongly suggests the document's content is designed to trick users into believing they have won a prize or are expecting a delivery, prompting them to click malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://crysiq.ru/uplcv?utm_term=brawl+stars+latest+apk
    • http://jcpingie.be/public/files/48848103544.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/dizotiludoridekutololevu.pdf
    • https://flavio-tonon.it/public/file/pitura.pdf
    • http://realtor-madrid.com/uploades/fckeditorfile/26549735497.pdf
    • https://adesso-moosburg.de/images/file/sovegesisatinux.pdf
    • https://asi-filter.pl/files/file/30745603355.pdf
    • http://laxycoffee.com/upload/files/91815335999.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/ruseririxubolakam.pdf
    • https://linkevicius.com/upload/galery/file/18441718309.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/t7421ika8bbp1hrattvesf0qr1/58992309398.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/64572001857.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/79791488514.pdf
    • https://jocafoto.com/fotos/file/subapetuxefolalefepotezal.pdf
    • http://sooam.com/files/fckeditor/file/1551671837613198e7244e8.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec589b6c9---jamefu.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210907_788A69B1519B6419.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301393004b4---83296676897.pdf
    • http://thomas-zigon.de/images/file/purelaxo.pdf
    • https://ctners.com/ckfinder/userfiles/files/nazeligenememi.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/fosafutusogesu.pdf
    • http://getsolarny.com/userfiles/file/wuvebow.pdf
    • http://otvorene-srdce.sk/userfiles/file/pevurenelunaf.pdf
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fotegisadudizigasigo.pdf
    • 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_off0000de0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 16792 bytes
font_01_sfnt_off0000f626.bin
8a3842810d3b772c5ec5fb991ee589f0cb264490ecb8c5dac945d7fd78e0f22d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 10160 bytes
font_02_sfnt_off00010d29.bin
ae98033469657ab7842e2fddb5029461d0aa01a4a03b3942df6d7219150a638c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 17276 bytes