Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c43d7ccc7cd0a7f…

MALICIOUS

PDF

88.6 KB Created: 2021-08-24 13:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ccd996658070247c2a7cce573e38f586 SHA-1: cd76625db0a30e83dea5f046adb8607f6f9a55ce SHA-256: 6c43d7ccc7cd0a7f20e3aa338019aa902c37fdbbdcfb2c2f9347eda25629ec02
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/wofuxisilizavan.pdf In PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/44035145036.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/13271747613.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/20837097378.pdfIn PDF document text
    • http://innotack.com/userfiles/files/tewaxilono.pdfIn PDF document text
    • https://vendax.ro/files/file/tepusapu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7c0c03a030e8d4e3d19ccbcf769bfbd5/42320913132.pdfIn PDF document text
    • https://latework.cz/soubory/nijiwonexif.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2v1b9pf8bt98qfv97vjn73dgb5/zozemudoj.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///1838894119.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4eafe5b7ee---kosuguletudabapul.pdfIn PDF document text
    • http://skisun.it/userfiles/files/namodopegamim.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/1r3o8kp7hbr3rk538o3e42rapa/99969400266.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/53df002b56211a5d437e608c3ecea2dc/fufenitaresusufa.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/porig.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/fadixe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c272f7a497f---figaxemasaxizowojigas.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/38630044490.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/seziveneruso.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/969d366372d991b6c38accc3ce3ba72c/44318614277.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/guxenijilefa.pdfIn PDF document text
    • http://fpole.ru/sadm_files/febuzumedobe.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/30885387424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+grow+snake+plant+tallPDF 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_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 16616 bytes
SHA-256: 96ec0e634d4713269ce03c9968db391027fc3ae070aaaa4c18131022e35f43ab
font_01_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 10504 bytes
SHA-256: c3c3aed46d616b700fd439388c6b5bb8757b65d5894f6482d0bc7ff2c2638d1f
font_02_sfnt_off00013a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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