Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6769fc29544832d…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 09:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e92108e2be7caf24d18f14590fda115 SHA-1: 1ce1ec2f4111e7752b11a1c5fb5e82ced6c3a349 SHA-256: a6769fc29544832d9f9587e9130a5fb74ace6ae9a96bdaea2973e3b3d130a784
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious. The document body is heavily obfuscated, but the presence of numerous links to potentially malicious content suggests an intent to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/dbe315f71a2b09da25cc764390bea9c3/83984766765.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9a1ae6a8fd98360515736133ec24ba01/famuzerajawukelarugob.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3034436f3782a23b8c3266b9557cd9a3/viwukofuturufik.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54fdcd3b94---sinoxofov.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h48aak6dg3t8v9paggeiiktk43/53438812660.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab8ce8a02---55951543763.pdf
    • https://arch.ua/ckfinder/userfiles/files/sazifogetupo.pdf
    • http://myphamlulanjina.com/upload/files/memikalumukido.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rbv8592l5q8lrl9u6q9b8hqcic/84021660920.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/955ef08e661fe088d712f38d5af23d79/50187487555.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gcgisl7fmckhlqjafiqj68ijhi/21824438163.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/bosewokowamavakaki.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1eac0a2c---dezofatimirogobu.pdf
    • http://df-2.de/images/daten/file/wowusu.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/49ed6bb9b1e066c35072107742807bc1/10674123250.pdf
    • http://buildinggodskingdom.com/webcms/file/gifikezazedofezi.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072896d0e453---43325509976.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/nj6q0ee8o6stqu3kdmt74ojahr/zufijarosatatipato.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xunamuzu.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/12a6360f39e8fd9b4e009c965a154ce1/11074339294.pdf
    • https://psfund.org/public/uploads/files/cms_files/83619309442.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/73861371341.pdf
    • https://morganmethod.com/ci/userfiles/files/94820881372.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=writing+an+exponential+function+given+2+points
    • 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_off0000f009.bin
c599ebfec333abc195652a6dc47d998281265f066a6b7472c9460161eb74f978
pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 11036 bytes
font_01_sfnt_off000109f3.bin
beacb15a8ca2531f62a04a840554ac91d3bc4643e62a4043a63587d4f31bb11b
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 17272 bytes
font_02_sfnt_off00013701.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 16792 bytes