Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edf825c8349c5e2…

MALICIOUS

PDF

91.0 KB Created: 2021-07-01 11:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 85a737fb53141f1f68395ee2dbd601c0 SHA-1: a29badf83d0a06b9fef1db80affbb9d937d99116 SHA-256: 7edf825c8349c5e2cb0bdc13e9878f3697fcc47bcd3e845e30c602f027208bd1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve to distribute further malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/41c9eda90abe445f020bb946cc659a37/nifajojek.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ee16c766dde0328ee4ee090239a5584a/79349381397.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/56203245499.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/50826826544.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5831ea5d9a---lipefezomezedu.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/ligimigojulos.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e8303c93e---92184537091.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/49246991245.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5b9c3f734---13226757364.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/nujera.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/17850561587.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4228e40c---lerajojutomomap.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0370853916---pezazuvadijuvadikitoguma.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073037852ca3---napelonatamibudor.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/64961245669.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/xarogafi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/88415947011.pdfIn PDF document text
    • http://szwygs.com/upload/gawexuvi.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/71javut363veq3fqo58aqgcl1e/nosokokexanukuteguxekale.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d080fea217---35303471442.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/xomofuzopela.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/mo9rhp4tduu2ikpj979phc5frv/rewudezaxutigogomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=to+build+a+home+song+meaningPDF 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_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 16328 bytes
SHA-256: 7fe27a66fe9969d79018d026c4ae05cca3844a1d7df15f33117029758b5c3bf2
font_01_sfnt_off00012ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DD 10700 bytes
SHA-256: f0efed18c3ab653c9a278700bac089cdf56e4dd729b5c9c888976f88467103dd

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