Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f9550d982d9eb7…

MALICIOUS

PDF

100.4 KB Created: 2021-06-29 05:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 398fd2350909838896b06c713e55cca8 SHA-1: 33498cb3b8dddc327cda80846c2ca5262bf53399 SHA-256: d1f9550d982d9eb74e98077133b8d4b44fc355b94979d59f0fadfbab707047ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://artenika.pl/fck/file/59706591137.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/4adcd7db7361cf4467b537df518c4b4a/fovelubomurasigokowit.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/foturavakudukix.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb343aa49f---31504193187.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdeaf49c5e---ruwibixatokazetepegitilab.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bdf9dc783ef0eaf76458bfa8cae335c1/selesidaxevaki.pdf
    • https://xuantruongtech.com/images/ckeditor/files/4410900400.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/db82a4f59a001eb433524da262a15a8f/92816406789.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607571406c8ad---70301755302.pdf
    • http://schs1968.com/clients/861610/File/vinotusob.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5cb559ebdce4b77a5d5c421ead559729/23637382173.pdf
    • https://burgaseguros.com/userfiles/file/7412480512.pdf
    • https://1877painters.com/FCKeditor/file/lofogeluxixawibumex.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1610b0e6b9---42451319599.pdf
    • https://media-get.ru/userfiles/files/20100105757.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8d7e477a34258c1363e595174424c737/15027193984.pdf
    • http://abacusnancy.com/userfiles/file/87159968434.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/dd3eb0c63263d30c9e69109863af0f1a/waperi.pdf
    • http://rainbowcaterers.in/userfiles/file/52013791954.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c5306ee1d5613f892c3de8310600cafe/wibisotefafago.pdf
    • http://alexlunacoach.com/img/editor/file/24878224244.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5f36b9ec---48981543664.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0f92g0hrr4bb02u231tcnmg7lt/74020459865.pdf
    • https://arhometutor.com/userfiles/file/94624856125.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820d0a1e49b---71392227998.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/4f571bd18aac47d25e7f64f384ffa181/35901523841.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=maroon+five+my+heart%27s+a+stereo
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001018f.bin
b8bcae448c16328211f2e9f37a893a3193406165f3e7a30edf135222748d8d80
pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 10640 bytes
font_01_sfnt_off000119ce.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 16092 bytes
font_02_sfnt_off00012f13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F13 16792 bytes
font_03_sfnt_off00014725.bin
fc42968a02860ecad3baaa335fb2973b6e6bd7589a2e33dc4f07a50fcb5ce02a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14725 26616 bytes