Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8ac751bf8cbfbe…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 17:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 378fc365066faef0142d9d6c1ea50d4b SHA-1: 27898d8761df8db4ba72132e5f2561c159230788 SHA-256: 3c8ac751bf8cbfbe243a7553b57d0605f1d6c988783a89e4ab3730877719769c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a "download button" heuristic and ClamAV detection further supports a malicious intent, likely to deliver a second-stage payload. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://studiosiciliani.eu/userfiles/files/1238198766.pdf In PDF document text
    • http://police8coop.com/UserFiles/file/juvavikalepadaxeto.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/litemixowimuxameladade.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161358fb490e69---56447055788.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/20869874297.pdfIn PDF document text
    • http://skene.es/userfiles/file/bapakomened.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091400141973499.pdfIn PDF document text
    • https://ms2oke.com/contents/files/xapetezevejapimunalewik.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/78358493239.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/begaw.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/kexatuxuwufewizokexawilo.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/54966542049.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/81671273251.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/65129981282.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/gugebaze.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a165fd5abd---58421272957.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/36146011549.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/90178953008.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/13574081837.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cec84186a4---43899237089.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/purifotedubonazuguximadoz.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/duwiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=world+at+arms+hack+apkPDF 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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/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_off0000d27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 20412 bytes
SHA-256: 1d91cbf46294a92da39ea83685883a0efd4cdac30ba5cdf041f3d774c6e376b2
font_01_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 10536 bytes
SHA-256: 06b1fa739dbbd557b07c5a9a3fbe1950ee5cf023f15eb9e61ad308c415dc955b

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