Malicious PDF — malware analysis report

Static analysis result for SHA-256 868d43aa5e5a8f52…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 12:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 115621d3de8ed9e79c7ef767a261ecef SHA-1: ec09187a02bf77712e6502b4d84c8d93cf4c251e SHA-256: 868d43aa5e5a8f522cea2ae2dc70129b1c9912407ae614f99b9e6f65e91941a3
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 trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=toyota+yaris+2009+manual PDF link annotation
    • http://100gastro.cz/soubory/files/7560794981.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210708_42B7EEDCF94616B1.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77a865f19---36836071722.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/65441959214.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0639d79ac---67388337211.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c36ed2ce6d87441b696e9b326b4c5991/20324377614.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/kameli.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/vesepuxagunupofar.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81eb97c01---doramofexakululivitoduw.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2228310643161e1b736ca7d774134ec9/jenunazejafidenusifem.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/palorizikilipim.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8638bcd67---58715249525.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d66b015c20---73186908585.pdfIn PDF document text
    • https://swiz.eu/files/editor/juduvuzazovivenurawufigu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d40a5b2386fb189f6a23c083989ebe18/zatupexewobafip.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/67059880521.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v580u4rcvii51820tkhhceluv4/bulakatajibesubisuseloseg.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/15147121845.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/dc95d6b7ae4e5ffadafaf3fc58087e7e/49099621135.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/38952281512.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/92960306492.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/jekagagopofim.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f88801cbe0---pirotajivuvewadakadibeni.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/27030067756.pdfIn PDF document text
    • 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_off0000cd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 17340 bytes
SHA-256: 77c6611b4985dabdc5d9e0d5e4b39e47a8aae42937ecc8ece2945e5d59bf9044
font_02_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 10724 bytes
SHA-256: 59116ee351a5aadf3b9b64f31ca4408a98d712882e11dd2537ddb89f68679fd4

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