Malicious PDF — malware analysis report

Static analysis result for SHA-256 a740130c48183e2c…

MALICIOUS

PDF

96.1 KB Created: 2021-09-12 20:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d8fc697f28d6d3d5bd631048ec3d175 SHA-1: d26f38269ee46a6fb248a8bb847ebba92994a891 SHA-256: a740130c48183e2cf07ca5cd1d26aceb06624d4d6b84a2b6249421591b353806
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://zpkprzemysl.pl/ckfinder/userfiles/files/mulujopewutakefoz.pdf
    • http://wct.goldcrownresort.com/magazine_files/files/11458282490.pdf
    • http://hevolta.com/upload/file/zapimunanazifimuziseniji.pdf
    • http://www.jindatunnel.com/up_files/file/dadanexotivopojumonoxoxe.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/tuzokitonosejoj.pdf
    • http://kibbkw.com/uploads/file/zekagodapepes.pdf
    • http://pactolous.hu/upload/file/8078769078.pdf
    • https://concertwristband.com/resimler/files/jovije.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467901a2d8---16050855263.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/528d5deb79f4368729e842cf809cfe78/bedadusoludemedas.pdf
    • http://seatraderhk.com/userfiles/18964649001.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/05c53e3c74cdf6c315fa453d693ab59f/25167300407.pdf
    • https://bunianco.com/other_files/File/49067790372.pdf
    • http://hotelgiottotorino.com/userfiles/files/66182357127.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/22412175523.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba4185b3e---62958532200.pdf
    • http://uran-berlin.com/userfiles/file/botovi.pdf
    • https://ciiinnovationsummit.com/ci/userfiles/files/78617988486.pdf
    • http://electriccityusa.com/images/fck_uploads/file/81176729519.pdf
    • https://cuichi177.com/uploads/files/202109010853001800.pdf
    • http://konemara.hu/userfiles/file/74660314262.pdf
    • https://mmtours.si/uploads/4105956053.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kt4dfbh28d1n3qnlio622rqse1/pebuzejizubenos.pdf
    • http://seattlebestteriyaki.com/uploads/files/mufupubilarin.pdf
    • http://tabouligrill.com/ckfinder/userfiles/files/fuwosomerazevadijeled.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=midnight+club+3+dub+edition+ppsspp
    • 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_off000110b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 16792 bytes
font_01_sfnt_off000128cd.bin
78df3ddfca3151c60b89e8f508a614862c5d0af5c3373434ee158c99d021758d
pdf-font-stream PDF embedded font (sfnt) at offset 0x128CD 10936 bytes
font_02_sfnt_off000141aa.bin
0d0d1e70dc0d38a38bc532a73804b460f31ea9f10a8fbcfa2de2ee232f3e872c
pdf-font-stream PDF embedded font (sfnt) at offset 0x141AA 18896 bytes