Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81a7ff385f0ceb9…

MALICIOUS

PDF

103.5 KB Created: 2021-07-07 03:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81b6cefafdb60d82f4e47be8326b3de2 SHA-1: acf63cc33f97785b73940327c2a54997a89c69bc SHA-256: a81a7ff385f0ceb9b029f7f11f62f6ef4933bde14017f7122377b180f770b164
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anhuicrew.com/upload_fck/file/2021-6-28/20210628170051540041.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4bf970bedc51d2d25d59362e4d3b39fc/zukepofuxafoton.pdf
    • https://irantruck.ir/data/file/vikad.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fb09652ecfa143ee7e70df5b8212e774/kegibuzibonavanumu.pdf
    • http://teormech.ru/teormech/usrimg/file/90872193913.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/40843a18e4d02ae9a7249f568ca89d60/17819932235.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfccee74847---jivikilebijajiki.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/an2796d7qrvssp8sn89a5qhd95/zaruzitemuniwudap.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710242200d5---61970028648.pdf
    • http://uniroll.pl/user_images/file/rowapomijilorewisujudutuj.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087429da901f---buxakexalatotanonape.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609710a64d945---36619801070.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b129f4b36e6---tolulawipulilimolovemo.pdf
    • http://liffeyartefacts.com/fckimagefile/file/1486483127.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926625d0c49---pinid.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6c70d48eb19ff2acb3ace748842c007b/60750367007.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3269f57d6cb414b58182dabc3d38c6ac/9368237161.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5f8f2fb416d44b1e009611df1b188379/totimixadibadidupejixiron.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608553cfedb4e---nebadezojesujutibe.pdf
    • http://plusk-car.com/js/upload/files/35706901518.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/12413054573.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/5cd1019d3afd16d962645688b33a1f19/pazedapotunisakurapinap.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea5d0af1c1540f0302365e47e9c20ad0/radoguw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=arm+assembly+language+programming+with+raspberry+pi+using+gcc+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_off00013461.bin
2cdf21fa3ddc69a3671c0c42f28a1a24ef2a17ac247b4c99ccd86792a00bf3e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13461 15900 bytes
font_01_sfnt_off00015d2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2B 16792 bytes
font_02_sfnt_off00017542.bin
74a748da7edc4a540b9618b45fd67b7bf43812862dd0afb30c38da1fbca041cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x17542 11488 bytes