Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc998a8034f6bc1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 07:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92a83e9ec202c5f5f4c159f2c90bc569 SHA-1: ed543ae4e66b9334232baacc60a25d8da62e85d2 SHA-256: acc998a8034f6bc189552663bcac3fd85057fc1dc53bf3671350f6a82b6bda17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://rajaketiga.com/contents/files/70658892950.pdf
    • http://milkexim.ru/imgeditor/file/40448891631.pdf
    • http://valdhans.cz/userfiles/file/metisifop.pdf
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/63002245314.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/vupisogowogeledagazig.pdf
    • https://euronuts2009.ge/files/files/3765932546.pdf
    • http://termocity.by/pics/files/kegilafevivogorepozu.pdf
    • http://nuraski.pl/wsg/userfiles/17068168145.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/kalakijanadimodidigo.pdf
    • http://lahma.pl/_u/userfiles/file/53725801182.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161435e8caac96---64885001518.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/tetabimexeji.pdf
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/9344237671.pdf
    • http://woykoff.hu/upload/file/6955311416.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b547e6b273---wizezigaruriregik.pdf
    • http://nurugelexport.com/ckfinder/userfiles/files/sojosijigiv.pdf
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/24087482526.pdf
    • https://maribon.net/app/webroot/files/userfiles/files/27051695045.pdf
    • https://badrivishal.com/media/52035399059.pdf
    • http://xtra360.net/campannas/file/nipaxibapadeteda.pdf
    • https://dienmayminhchau.vn/uploads/news_file/nevakalemakirowagun.pdf
    • https://perfumes.dropship-tracking.com/userfiles/files/17880891415.pdf
    • http://studiorestagno.eu/userfiles/files/25853455555.pdf
    • http://nifaelectronics.com/userfiles/file/xizupifubomozomatimik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=kirby+64+the+crystal+shards+emulator
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c9f47f531---84996534997.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d823.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 16792 bytes
font_01_sfnt_off0000f035.bin
d80a787abfd14f2d97e3f833518c3577522d1d5e3e7f8697f263d71dcf76f674
pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 18584 bytes
font_02_sfnt_off000120b9.bin
3da637afdc1240e1fbd48de699f97d7a71deb40bab30ffccf22c21b3c47522da
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 11124 bytes