Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7cf63399788e89…

MALICIOUS

PDF

82.8 KB Created: 2021-08-20 05:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3faa22edb8705922fac3ac601605de3 SHA-1: 1dbbaa1e3476985dab6e966e145b364753991d7d SHA-256: 7a7cf63399788e897ac591d2f9d5d267e17f93d879a105a3512aa78deff55eb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, many of which appear to be compromised or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the PDF is used to distribute malicious links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=faded+alan+walker+piano+sheet+music+with+letters
    • http://rocb-ap.org/file_media/file_image/file/43450959006.pdf
    • http://dolphinkorea.com/files/files/32806068702.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/246451af3e85c191356eab4d018a6a04/60788876934.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f8c73107---nedutafupakefolon.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/libofot.pdf
    • http://brandnewgoods.net/userfiles/file/fagakoliziwibozo.pdf
    • http://npas.ru/pic/file/banisitugugimuvugezowot.pdf
    • http://dok-vo.ru/userfiles/file/60024786556.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609188534dbb2---sepenibazefitokitesefiku.pdf
    • http://constantemails.com/userfiles/file/162569468318083042000.pdf
    • http://reicar.dk/userfiles/file/rolapisuxuborefenazopa.pdf
    • http://kursadowicz.pl/Upload/file/tomukiwaboredejipepoke.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6c9647686---mozop.pdf
    • http://dsagco.com/Upload/file/77592817788.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3e008a5e0ca9199057775017b3fb2040/31498359030.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4733bc1e---paxiparimilurodifo.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/af96d542b7e007f2632c60b26713433a/japekatevororusetigeles.pdf
    • https://lotteppta.net/beta/assets/file/39714686926.pdf
    • http://tuzvedo.hu/elemek/file/80439378069.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2baa6e3062---ragokaluda.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090709d5145e---43496331980.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/66626583700.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c2b4a2803---wosasigiji.pdf
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/taviforomebarosa.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_off0000de58.bin
dd807f36595ba6cc82b039dac58870706247e7ebe5960bae2135f92b0202bbfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 11036 bytes
font_01_sfnt_off0000f7d0.bin
7997b65e85a3decbb9449f7e8589f05f9acee4fe5ade9a0699a1021409937db9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 17192 bytes
font_02_sfnt_off000124eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124EB 16792 bytes