Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27b309fef56b3fb…

MALICIOUS

PDF

98.1 KB Created: 2021-07-22 10:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 079100e415cb1edb276e9286e7817ae9 SHA-1: 1bc08ebc452dcf25e2abc1019b60f54cc8321fa9 SHA-256: c27b309fef56b3fb59af7f563a0cea6a59fa4a8f89b4ebe9e778f77f7473d383
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a likely phishing or malicious redirection campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to malicious content or further compromise. No scripts were extracted, but the extensive link farm on potentially compromised infrastructure is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://asustainable.com/global/file/4008489966.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1vddn490skj3eebis4rfl69b90/47417093520.pdf
    • http://fotossc.pl/_files/file/67669580544.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2aa390e4d4e628761d44bc87fa2b3bb4/bebibadiwuzi.pdf
    • http://wib24-admin.de/uploads/file/dudofepefi.pdf
    • https://rkdestate.com/userfiles/file/92828373913.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a6221acad---takanerojanafofebojib.pdf
    • http://studio-castiglioni.com/userfiles/files/fomagabatukefejamesufa.pdf
    • http://technocom.pl/editor/file/vifupinufigifewapeno.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072d65e310b4---mesototedobexopaxezelusa.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/mawezirokevovilasowe.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bddad36e7c0---juzewovebimubipisadin.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/635cc7b695e669d365feabfbba892437/nuponuwuwamur.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b589eb10b86---nafidip.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/efp7glptqjuunk4tk02fe92b81/29581188010.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a13235469c1c00a0c0e262f21f317c4c/zaxixinofodu.pdf
    • http://blessingsngo.in/userfiles/files/28445505249.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b524b50928c---kagobevavifoko.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f1677edda180b5347511b2ebf8e288d5/40651172740.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077918e1c4b2---8175947711.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aaa4a1543---89675329813.pdf
    • http://szentdorottyapatika.hu/files/75344184864.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d900e20af0---87994094142.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087b96665d95---20143630415.pdf
    • https://shopinhome.com/ci/userfiles/files/rowixomotejoreluxile.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+turn+on+keyboard+light+on+macbook+air
    • 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_off000118f6.bin
780b02e2a143c8737c352ddbfa8b85d1d79fbc1e19144f209b83e0acbff55af7
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 17748 bytes
font_01_sfnt_off0001480a.bin
4fbf830182abe2315fb2b0692fb3ea469b01b0c000e9c8cad1691f24b0ce4667
pdf-font-stream PDF embedded font (sfnt) at offset 0x1480A 11172 bytes
font_02_sfnt_off000161c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x161C8 16792 bytes