Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9f260c6fe09329…

MALICIOUS

PDF

98.0 KB Created: 2021-09-05 02:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08208bac5e8e812edbdac93af6a56a71 SHA-1: abc76f9c22542c6a245151d93634e64056954a5c SHA-256: 5c9f260c6fe093292cef5b3aa8c6e7baf843f7dcd4b70bbfb2d682694f6fae6a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://clubselectionvoyages.com/images/file/wiwodijobipawek.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607034b99de2a---potada.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464779ca3b---vogezivuvopuvum.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/velulinaduxi.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/sorogesus.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/panekafexabivunor.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610abc5b0aa1d---kimuziwona.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/54188190605.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jedonenanobamelavin.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/newazapitazamifavila.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6801e4223e1d6bb065f2953d27bcdc55/toxenomiganudatekam.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/97293597400.pdfIn PDF document text
    • https://preciseenergygroup.com/media/84180158603.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/30545549744.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/piwakudasipemonefax.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/ruxodazegiw.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/7290610113.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202108250424262612.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/44688010173.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f912b36bdc9bad0470317b31101c4ded/3499079805.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b29f0ab3fc---luzek.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/84919174335.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3rsq0cc65ts0htl3p9ie5ataps/wuwekum.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/fibalogi.pdfIn PDF document text
    • https://tempegaring.com/contents/files/93681436043.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c84daed46---76669528783.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/kuwilosumubabeful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sql+coding+for+beginners+pdfPDF 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_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13275 10896 bytes
SHA-256: f542c91e30f6e54775d2b8c35a1b353ce3a9d01705eba2079ffbdc144b6d4ad6
font_02_sfnt_off00014af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF5 17976 bytes
SHA-256: d44d57fbccb6a9cd1fe0d45f1dfab77d8a24b9af8a799f047480312e4d0053c2

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