Malicious PDF — malware analysis report

Static analysis result for SHA-256 282ad2e36b4b0677…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 09:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0dcdc32810906c999c678437bd872826 SHA-1: 257df8a5ed27429c85367bfd76b7fa985835e87f SHA-256: 282ad2e36b4b06776cc413766566bc5ff40250dacfd0c39f058cb0db7ba54fe2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded JavaScript, which in turn likely leads to further malicious activity. The presence of multiple links to potentially compromised sites reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=informed+consent+in+research+ethics+pdf PDF link annotation
    • https://bulgariapools.com/contents//files/51985190931.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/rozedeposapotiji.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/09l6h0i913s8e34lhdut5qoe16/majutevotonupobize.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/xisixamotetipiwuweb.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/guzubijumidawezanefasufa.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/megurotalupubazewepufibi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3df406056b---95904385241.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1a811ed1e---57930998278.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/21106004480.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/81c590eb1410fe506e6e4ee5fd117ca6/vadujipotofewiz.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/12694626576.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/zamilofopuzed.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609268af7d4e6---kajulomavozezofiwu.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/1e035528c85ccb111faca39a3d571584/9603415145.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/76569817637.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/sipefevebekadovezuveku.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b081aa8c---fivenuduwowajukakika.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/nazodirudiwotepumi.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/rulusasisowow.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8cc2cbd291d88c87c03259f65cc9bae9/refedororiz.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b666ca605f7---seragufavolexomuxir.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/pemututoverowuxewaruda.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/493f082d637246a11c73f5b0f7309f0e/36097635730.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5fg78ie9nv954i42tjcfmkg7n3/36594707671.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e47296249c---15347005936.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/wakuzezutegolo.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_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 10788 bytes
SHA-256: dbe94ebf561272f76f26b773e2080f308ff6a6f07b43ec0f50db9a074e3236c3
font_01_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 17496 bytes
SHA-256: e7f6a1828386b3f3c7d020a3779ec248390a4d59291298791889d8819f93c0ba
font_02_sfnt_off00013557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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