Malicious PDF — malware analysis report

Static analysis result for SHA-256 8156df3f427dfa0d…

MALICIOUS

PDF

155.0 KB Created: 2021-06-26 01:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25e079facd7b249779872ef7531a64be SHA-1: ec51a838bf010d13126ca4857b66e2e8688d43b1 SHA-256: 8156df3f427dfa0d366ff8dc374c98807349027b33496e67fb5178fd93159a14
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to redirect users to malicious content or download further malware. The presence of embedded JavaScript points to its use in exploiting vulnerabilities or delivering payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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 https://garglob.ru/uplcv?utm_term=sentence+with+the+word+generous
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d87beb20f---83731629383.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qitt1lrlh3rvpnsejnabqtj3e0/nopagasenok.pdf
    • http://abwpetersburg.com/uploads/files/70995529088.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/hsn6juu1rsj7n16imukihtnsr5/51444232548.pdf
    • http://www.tekkoo.net/images/library/File/nuxela.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d37e273402a9f7e862d387743c5482f9/bapiwusa.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c9a668441---9176972499.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f2kcgotf86rj2d0s169gbf1lpk/72682047498.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/543a0058d2dbbf110f6b0949fe5ba527/56465392982.pdf
    • https://fruitssupplier.com/app/webroot/img/files/vewekomusavi.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c52760e1a5bb272be6be9498c439d3dd/tabomikufoforodab.pdf
    • http://sk-massimo.com/js/upload/files/17040280458.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b778c33199e---38331222797.pdf
    • http://datavincity.com/uploads/ckfinder/files/6888960403.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/nedolerolaganifuvone.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/s5kst47nnedjcbbalb7rk4jipu/85558235742.pdf
    • http://alemotta.com/resources/original/file/nimejabatepabewuxaxip.pdf
    • https://angkortaxiservice.com/userfiles/file/buwovelixowikok.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rcu7vhoqem3656hc7b4io65gfo/gurojasidugijaxuwowi.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/587jl4sbdrk8lom83c2qp44t41/43242436173.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0isv5vcun945stkcbknaq2kvq7/kegazajoxosalew.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_off0001fba1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBA1 16792 bytes
font_01_sfnt_off000213b8.bin
d01aa2d22072ef8452fd2f5455464bdc2f19e01a2ae4eb418078d48195b66d4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x213B8 10704 bytes
font_02_sfnt_off00022c10.bin
69297ea4784dae96381e80502021394a7ad84d2b2538509a419ec9f5653c7a56
pdf-font-stream PDF embedded font (sfnt) at offset 0x22C10 18728 bytes