Malicious PDF — malware analysis report

Static analysis result for SHA-256 a845efa4f30fa48d…

MALICIOUS

PDF

90.2 KB Created: 2021-08-12 21:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f393bee10a99f0b27a2350f7857615eb SHA-1: e648d5893e9f655f374276ee943f9203a12fc551 SHA-256: a845efa4f30fa48d79d9ad1550e249333a6a84ada1495aa313aa614208556528
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with many distinct hosts and UTM parameters, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were extracted, the structure and embedded URLs point towards a malicious intent to redirect users to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bfr-bialapodlaska.pl/userfiles/file/10823561932.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/uvel890vvp4pue5sspuiov0db3/3404726403.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/pezudolo.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/47020548419.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f5502824bbcc6ff56bb2af91b3b639c9/sugewowedutamitidatoveda.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607365cae572d---nebepuvafutikesazel.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077be666d0d0---32781731409.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3ab7b390d734ac066faf273bca59a47e/burufukawozawesivunomujav.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6f7221119febef1f3f01f07578daf13b/53776250606.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/7928027975.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/47271922574.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vigelajajulagodum.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/ponaxonoxajujanakize.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/88088175339.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vijefakojoxetojenig.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2eb0fea6---87179782051.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3f2809a0f1693f87804a25e9c9455caf/togekir.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/41870237275.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608776eb34409---kojowobedubakegedikekobu.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/59650877076.pdfIn PDF document text
    • http://freeski.hu/freeski/file/11902312010.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/19813262325.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7b6dcfe2---14289755370.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rmn6m0ql7gmlp9g2b4klu3t5v7/vovidakogowowemuzaporu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/pd4p9ep93pgfb3csvjbsmf8ov8/24950622527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=why+is+my+lg+air+conditioner+not+coolingPDF 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://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_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 10924 bytes
SHA-256: 039225787337fcd381c1e6257f4fc93a77011dcc83b2dfc570d27aab82c213e1
font_01_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 17328 bytes
SHA-256: 199d496f193232e60e9d4b936432bc59d998b9be2f31ff8b054e67bac81381b3
font_02_sfnt_off00014836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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