Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c785a42860766b0…

MALICIOUS

PDF

73.1 KB Created: 2021-09-25 04:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bca00b6defa8aa1b23c275960e42cbc1 SHA-1: ba5be15361bd1e858f5ebed4e0a10389adc6890f SHA-256: 5c785a42860766b0218d4b32cc7c8d354bd6ff341d631f1a3324d6f8d07df6c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://thesecurityguardunion.ca/userfiles/files/95703849143.pdf
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/17540777558.pdf
    • http://fruitsad.pl/images/file/96357043369.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a0a49692---penuzewa.pdf
    • https://autosaloncenter.com/uploads/file/gejomedumotive.pdf
    • http://centreforeffectivecoaching.com/media/file/6149094755.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a32dfc34f25190eb049b388d927ca5e1/bagogewezilori.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377bd20ab1b---gejewunavunexi.pdf
    • https://somogyplusz.hu/files/jadusewoze.pdf
    • http://avesta-hmora.boj.se/uploads/userfiles/files/77446307251.pdf
    • http://aqcorth.specialty-match.com/upload/files/51994022257.pdf
    • https://galaxytraining.examinationonline.com/files/vumoboniwipulifike.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/wewodumedi.pdf
    • http://pc-driver.ru/userfiles/files/zawidegikiniparixezobew.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bb8070b7a---47869926035.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/lewavojimumixexogusutabu.pdf
    • http://lmtechsolution.com/userfiles/80579138748.pdf
    • http://sp3siemianowice.pl/userFiles/files/60985030374.pdf
    • http://www.nbc.com.vn/ckfinder/userfiles/files/bosokejoxete.pdf
    • http://parfumland.sk/upl/modilubujoteve.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cb5839eb36a8e5bd89026c371f7d5180/49979761810.pdf
    • http://3wsystems.com/shipinc/userfiles/files/surupomuz.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/8631907949.pdf
    • https://xn--interpeas-r6a.es/upload/files/gijotonumaseponepo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+remove+a+snap+filter+from+a+saved+photo
    • 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_off0000b71f.bin
2b4efab20e31a9eb2af83ceaa0c3697fb21330f46338faeb7e531c302f975da9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB71F 10904 bytes
font_01_sfnt_off0000d02b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 16792 bytes
font_02_sfnt_off0000e83d.bin
ca61b676089a0fdaa3101c7ca128020bdff8f5de3235a70182a334be7632a095
pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 17868 bytes