Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6ab21409f8895d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 21:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 557a9cc99486627c0dddeac3ef9f434a SHA-1: 8a3a097b9cc5c72077f0ad16583c6b1c6f419b3c SHA-256: 2c6ab21409f8895d49ea762f36b603f7ce142b6cd07a717692b389a35666366c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cesnek-vysocina.cz/UserFiles/File/vewebevedu.pdf In PDF document text
    • https://akconta.com/uploads/files/81288370452.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/fbcb4cb738f856e302522af852dba445/moterubaxi.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/72811307178.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/44559859426.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/gefarazakalinisakid.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///dezovagejavipim.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/72467472791.pdfIn PDF document text
    • http://paliukenas.lt/i/File/56267638988.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/juxokaxosina.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/24240877881.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/zawipik.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/82355496945.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609847020a390---96172534260.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/maburenizemukovamej.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/82197128827b1b05eca1cb44ceae4f8d/najegasopovun.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/nolasexikunagabotoloroxu.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/xupuxuziwovazirugar.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/folobegugafasomapesoxad.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608599842abe6---97248727830.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/repebowusik.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/a3de4fcf43f433d0e935a2b0db9b76ce/65081869436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=i+am+entitled+to+my+own+opinionPDF 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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 10436 bytes
SHA-256: 5534ce59cc1e7cb93b645be5b3f0ff6156c63daa5398511cd078177834aa1e16
font_01_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 18576 bytes
SHA-256: ab4f46f647898c0ab1fe70c67ed0b765f41aa3e8e315826d523e0bf76b6d38d7

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