Malicious PDF — malware analysis report

Static analysis result for SHA-256 4134c6d2eb6cd1bb…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 03:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 772dee5780210321a5984a2f2102001f SHA-1: 7c85dc89d1bd6175e6a19a0b409d1b35cdbd32d7 SHA-256: 4134c6d2eb6cd1bb24a5243155c0fa68aaa9c89a587358703a8bf45fc5adf285
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate the document functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, with one URL specifically pointing to a compromised CMS upload. The presence of a 'download button' lure further supports a phishing or social engineering attack. The embedded URLs and the overall structure suggest an attempt to trick users into downloading further malicious content, possibly disguised as game-related files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://nfc-lampang.com/user_img/files/lijigebemasi.pdf In PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kupemawomojokam.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/24385321612.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/beleje.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f91495a03c---xuxadivegipowemekonuba.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/10640230801.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lugewifizep.pdfIn PDF document text
    • http://belniig.by/public/file/memunuwewojepivizizu.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/86513713633.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/lalev.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/72326916745.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/tixulewat.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0710525f---mululevejoxukusumerebaso.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/2454561098.pdfIn PDF document text
    • http://kesifveotesi.com/files/babojudujuwomobe.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/09hml02elp210vp02j21ddhpae/60849736042.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/gabuzogozezezinitak.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/fowiwimubev.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/jowozagaj.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091610561382.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161343fc1ba40c---xalafana.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/42840724798.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/53641990452.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/56835719048.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/23202730112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+emerald+x+and+y+downloadPDF 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_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 10444 bytes
SHA-256: a13dea95ff7132fe05569e74d818fba2bfb79f88bb9915e51af2ac25cf3321a1
font_01_sfnt_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 19224 bytes
SHA-256: a1da362d0c0e8496b3ac77670a853f31638a84698ed9fe8caf89f67dc7708cd7
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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