Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f697f0c852aa91…

MALICIOUS

PDF

99.0 KB Created: 2021-06-27 07:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cb439270b366ed96cfc29b0f22aa01c SHA-1: 6cd0633103d15e4e74d6144f2b2d90da0842f53c SHA-256: 87f697f0c852aa9174e4c02b34fbc5a1fcbc78dff44ecb3ed12131e41b0ce07e
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://hattingtoemrerogsnedker.dk/userfiles/file/78823315834.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/de09863ca189c0526c4ffe4fb7150297/jatotutiliwolavuwibezaba.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/peed00mg0bbrl6hapvr9c5mnmf/93085904725.pdf
    • https://dcoderesearch.com/uploads/juzowugarupubumaluwa.pdf
    • https://hoalavender.net/upload/files/tovezikevenafimabama.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b4860214f---mojanulononuguxovaxoka.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16078410106c79---86517858310.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/694e44a0ae387dbda5b0d94ad507bda4/fikoluregukojunonada.pdf
    • https://bloomland.com/sites/bloomland.com/files/gukukud.pdf
    • http://globalquestconsulting.com/userfiles/files/roboju.pdf
    • https://addsfly.com/userfiles/file/91062728062.pdf
    • https://digireg.se/upload/81171184729.pdf
    • https://anfauglir.com/images/file/27994525948.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818ff9f1a58---57997328705.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/q8ene9qcl7noek6c3p4sm0obv4/felazej.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/xubupujizanumebital.pdf
    • http://qlinairnv.be/userfiles/file/dezogewanewonipevupa.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5769b88324d5d85e538bc19d94d1075b/jesisito.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae47ddbc737---71684190810.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160992d982ba60---27444453309.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/v0rstu8nnuaku668euskqu9016/fabosakanijikenakafufo.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/42350993559.pdf
    • http://epoxidice.ro/mm/file/62583063729.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4c41760b060042de923e3032c70d8ac2/letabi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=share+under+10+rupees
    • 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_off00011f96.bin
5804453f504ae2d22266a69e13ba77ea416783fef32c587c9c997c0e4cf2e75b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 18072 bytes
font_01_sfnt_off00014f43.bin
93d42457e6ca79026f5e09bff6ba14e0435985692e15c6890023975a93261521
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F43 10484 bytes
font_02_sfnt_off00016702.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16702 16792 bytes