Malicious PDF — malware analysis report

Static analysis result for SHA-256 a990a277f3d2d860…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 01:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe8643345946a3fd1dfeda7c4b864cbc SHA-1: a33e530bc4418bcf357c31774b56381913891bf0 SHA-256: a990a277f3d2d860603e158ae3731fbd729857296861c193d48f64268cc44492
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully analyzed here, likely contributes to the malicious functionality by redirecting users or executing further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://naves.cz/res/file/votonugakeridew.pdf In PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44832049349.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f48f58849ba13b8add752eb6334f55f0/xefaxafexurilinowonejewev.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/nefaxun.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/xesixexefuwatusedafafepav.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/27089556947.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/mobirovezipid.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/24049511760.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/71993827400.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/74153942735.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/44787575405.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c4b357d85c40ae1db177c0c228d7eae3/lelemoloboduv.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/bujotujogu.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/ddea4221b1f9fe5e29fe64260f1f0d4b/pajevuwu.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/wejasesiwamotewiledopaji.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/89e904fa1fa50d20db2f0e9a87efce9b/boxakodozewavofiwajen.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091890389b60---28910985913.pdfIn PDF document text
    • http://web68s.com/upload/files/27437022244.pdfIn PDF document text
    • https://grandmake.com/userfiles/28790268178.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/309fdmnvd2efvsirnrdtifqgi5/malonevetizizawepom.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/91451855824.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/47739396168.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/6228470714.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/51266756023.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9393470210.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/dolurezakokifunawamupaxa.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021080212115944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=difference+between+mineral+oil+and+synthetic+oil+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 11224 bytes
SHA-256: 355200010930d07bcd617afb9d45606437111b9d4488b2beea78b4cd3fc05fe7
font_02_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 17448 bytes
SHA-256: 925806808baf5a45ace9aff28209be33fdb1a99c4ec240faec0c3d3628c60ddf

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