Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd6f077046843c2…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 20:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf95f9d71eb49abaa8672e27748f6d8e SHA-1: f1e73c25d53b3094d16bc5842a8c91ed1f8db4a8 SHA-256: ccd6f077046843c2fa99bbc6d8532fabdd21c3c19b53e2e6a3285eb16e30ab2a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple PDF files hosted on compromised websites. The presence of numerous links on disposable or compromised hosting suggests an attempt to distribute malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://adlinefor.com/home/webagen/public_html/korn/data/file/pageda.pdf
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/miwanepexojezi.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ac9e7a6fec6d507edc2011a02a731bd5/4960385745.pdf
    • https://webtechnocrats.com/upload/file/tubovudevonepuzam.pdf
    • https://ladachess.ru/userfiles/file/vepefuneladetakesamow.pdf
    • http://eventechsite.com/files/files/32444542260.pdf
    • http://maskaevlawyer.ru/userfiles/file/74770822995.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ccb97170ae---58651133363.pdf
    • http://artospace.com/pics/file/razek.pdf
    • http://krukewittfarms.com/userfiles/file/bulowire.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/rnh747500cpnedibgj71tcfcbv/kasobalixeluzuku.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6c8d5758f---78318584066.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/74940544950.pdf
    • http://serramentisiciliano.it/userfiles/files/gumur.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7f96aa117---85768682256.pdf
    • http://charontrade.hu/data/file/damuvisivel.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160961982b2be4---zulemeloridise.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/soxojufuvunozixuxif.pdf
    • https://artenika.pl/fck/file/zupikimonojesikivagirexe.pdf
    • https://ap-qatar.com/userfiles/files/xilorili.pdf
    • https://granitabrasive.hu/editor_up/subadazobo.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/zopawidixijit.pdf
    • http://peneleos.pl/userfiles/file/sakoparosemusidiwavi.pdf
    • http://vce34.ru/attachments/file/xuwiwuv.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/be90bb56891e307f09a41e5ca6469f4f/kurexa.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/p6872kss1ntp7ut1peoepsasd2/38924234214.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+angles+worksheet+ppt
    • 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_off0000c108.bin
07338a494821a8265baf36d12d072119232c96ffc090173fc3810fd4842ca62e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC108 16252 bytes
font_01_sfnt_off0000eaf1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 16792 bytes
font_02_sfnt_off00010308.bin
84f171b32d3abd67e14a7124c74adbc5e7771673d6df1e8745ee02ac5e5eae86
pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 10800 bytes