Malicious PDF — malware analysis report

Static analysis result for SHA-256 784825b92df7ab0b…

MALICIOUS

PDF

79.3 KB Created: 2021-08-18 19:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd442a7051625f9fe43eeae9d220f75b SHA-1: 5b20bc8e3c288b798b6059b27dc30ab1ee93d59a SHA-256: 784825b92df7ab0bfbddca60a113c87a0b5608bccefccba1c92dac1bffbd2397
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coming-c.com/userfiles/file/gapux.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/51393e2e010577690315dc6a8adc52e3/22069097409.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/wisumidelisakenowaka.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc8e21f34---lubinirokobawet.pdfIn PDF document text
    • http://wohingltd.com/userfiles/madiliri.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/1e9io13a3lp5fjojbrkhcg1bd0/80946064231.pdfIn PDF document text
    • https://memoservicesrl.it/file/kupotupisovutunisu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd609fad3cf---27044054459.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/73616087926.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/32605434879.pdfIn PDF document text
    • http://letdentalab.com/img/files/26310925475.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/6be59c981745c6e5eec41558a6dde3ff/gomeloxefefemizifumog.pdfIn PDF document text
    • http://hkalc.com/userfiles/zizedomovowegoletipodexo.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0a99a115---82231741901.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/muxuzaregol.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/67929340232.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/puvuwomavitefawunizabikor.pdfIn PDF document text
    • https://lasanisports.com/files/wotuwiguxasofi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32bc41ece---87572773450.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44dddb89aa---35523217744.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/8688479310.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/5641ec0eff865371a30c4f8283f8a3c7/96404112713.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/lalib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=yamaha+rx+a830+aventage+av+receiverPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 16484 bytes
SHA-256: 1fd25d0fe3a6c02121f6b8837d516bcfe2a1b71a67284c9bc2d93d8eed25110e
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 10996 bytes
SHA-256: fa19955369ea61ebe1c6b0dbf500b72167d4764344dc20239520aa639e61fa9e
font_02_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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