Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8228132b7ff48a1…

MALICIOUS

PDF

72.9 KB Created: 2021-05-18 13:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71d60df4b275d9e1c00c6094aa64e600 SHA-1: f5a1ec921d9521e7b638cfaf37ae39de1bcb7ba2 SHA-256: d8228132b7ff48a1678ca702a92d0516a72fad2da135cf55e87be9e6043d45c0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits social engineering tactics, specifically instructing the user to execute a command, which is a common method for bypassing security controls and delivering malicious payloads. The presence of numerous links to compromised CMS upload storage and disposable hosting further indicates malicious intent. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious content, likely a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/bpk3g2dhlk5c4vsacitf1j1edg/piburireve.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/d8l9q6dv0kr7b43mov1ki9k3k7/gutapova.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2ft4g8t5cn5oioj79mcc04lp30/75638387120.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094849ddc871---80267029708.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/nqfmpaicbr06mjvugu1jtrqsob/70309994038.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607658f827992---54577381091.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/0f4fd3218e04955aa62d22d50d872d1a/53871220705.pdf
    • http://aryajob.com/user_upload/file/rojugefijusosoz.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/f6dff60615de60d90d89ba92fbf8e0f3/9841588640.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/45f7a6ff2792ed4af66c52062e36e280/degadom.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/zajolijeb.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/q45t9piijjgd2429un7qk89bfh/tawezopigokizifeje.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2b5cbf2ba8c93deba328d355b9c6431e/69378043357.pdf
    • http://accessiblevehicleservices.com/userfiles/file/soputejukidenidokeritun.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/1bt0cl0tpdnab7qakj27g28dle/63387044533.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mxq+pro+4k+firmware+download+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23b.bin
8dba406068422a05001a8cee7c54808e9dd0f9c6fced08cbfaa56941d89da002
pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 5452 bytes
font_01_sfnt_off0000e4d4.bin
e84337a8fbadaaf7087afa412d5f898d8daa9ae8e84924f7a2ba9a9c1985ab6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 1656 bytes
font_02_sfnt_off0000ed26.bin
5895b8f68abb28b5800990e2c9c4322e362d710220d335d087acc0767a5227f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 19112 bytes