Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d36e7392954b770…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 08:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4d3d1ef3f4314ab96ea2f1469bd4d59a SHA-1: 1382e37c781f7cd02136b2c98415ff87c92ad16a SHA-256: 8d36e7392954b7703e914afacf388be7a3fb3c9e3015540b8a46d78ac512d0f3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The PDF structure itself does not contain readable content, but the presence of external URI heuristics and the compromised CMS upload link farm heuristic strongly indicate a phishing or malware distribution campaign.

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://wastran.ru/uplcv?utm_term=definicion+de+parestesia+pdf PDF link annotation
    • http://hevolta.com/upload/file/44045365429.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/09d3dcd884d4ab0980deb7c326210461/moxexelaveselepanu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/63720eb2236a404d819ceab3bb7debbe/zunofirejamoxibage.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160856e5620c9d---dufafatesejumod.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/kosuvedolesavu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8d906a8f---69629473915.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161170420b30aa---givego.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/levapanaloxude.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3qg4466rrghhh3u3nfamihupjr/tufop.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f52a91d5695d40fa9337a0f16848c0ac/xixuvekogomemud.pdfIn PDF document text
    • https://preciseenergygroup.com/media/javenikaz.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/lebabibuzuvo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/316efaf9b0b471ffc43f9cc4b9d38c61/55763805840.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/mezasijifewulu.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/75841822435.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab12bfadd---romomaxumewugus.pdfIn PDF document text
    • http://pk.mo/userfiles/file/wimufoxanubijaxe.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/vaxewel.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/36931346572.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/42887485615.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f5f222a0---42981217403.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/muwedunegavadej.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6b18f096---60241316327.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/topated.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fac80abde2---90032896585.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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 10568 bytes
SHA-256: 7e558f5b1317d194d0fffdf5ed6da3ddcc90ac7cb257ac2e8efa39b918b451b0
font_02_sfnt_off00011458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11458 22628 bytes
SHA-256: 4161747d0141044674b6dbb654e9af92098bdd4d5440559a9711c1c7ea73e142

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