Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b1eda9371d23ed…

MALICIOUS

PDF

73.2 KB Created: 2021-09-11 17:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b6bb68c7ebaf9a8872ce1c98c1e3198 SHA-1: c5528856e310b9a635f2a5bd142e7bc54dd0bf4d SHA-256: a9b1eda9371d23ed150a0003e85008982a880bb58b67c5ceda4158789b26f1be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to potentially compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm indicates an attempt to direct users to malicious or compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://podushka.by/files/files/bozutovubiwofo.pdf
    • http://sportservistocik.cz/UserFiles/File/zogebum.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210902_030047.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/zugufolo.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a2c7176a2ac01acc835f146c6037edd8/lajatodonipumif.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c0c7f8809ea0453f50be50de8e7ba082/famirazajamudaduzovurore.pdf
    • https://eirai.org/editor/ckfinder/userfiles/files/biwepexaref.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/39276828287.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/korubolilat.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/selarewagov.pdf
    • http://terhautz.com/upload_files/files/43865067971.pdf
    • http://eca.or.th/ckfinder/userfiles/files/63618972490.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac504b744b---7502363360.pdf
    • https://atputasbazes.lv/images/userfiles/files/76357936895.pdf
    • http://grandfiltr.com/files/file/joxopiralanonulozutaw.pdf
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/pisesovono.pdf
    • http://machinesupplier.cn/data/product/file/2021911_141930_716.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/vilojapaligefokigilij.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/omhctab7kt7a94vf2dnkc2ik05/78714745561.pdf
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/54295300983.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ea47c7c1876935fdfd85fe593ecdfe2f/kemerofetijutetovasata.pdf
    • http://motolargo.pl/userfiles/file/44639517904.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362c2ff25d8---15721064572.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138291448720---28751991875.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=write+over+pdf+online
    • 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_off0000be3c.bin
1354fe1a0c959d09fc9ab373b6bb2829aa83e5a0bac499e01cfdcd74085f0b4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3C 16476 bytes
font_01_sfnt_off0000e890.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 16792 bytes
font_02_sfnt_off000100a7.bin
fda625faf813098b590a124bb4e8302c4d1900cd5203013731554cda60dd26d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 10220 bytes