Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40ec4a83f5425ad…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 11:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5069a9d0e94080c3ac1403de3a167130 SHA-1: 5bf6affe952d5aed9a33bdb9f6236bf3e25c922a SHA-256: a40ec4a83f5425ad4be1d82b0426e805cd0406800ea9a781ff7ae5ebcadeb7e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests it may be used to facilitate the download or execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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 http://jvcc.cn/ckfinder/userfiles/files/2106050850316788413507e.pdf In PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/79977543025.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/raxinisuwul.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096066cf3f6e---jivame.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ksmu3m30fifpt0a1471t8aq091/14812274121.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/83559065940.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b252458400---82924795040.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847fbb46080---viwolevudivoxebabixew.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/006oc16lvgkjeo7rdieu3ovud7/12640394162.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/19871932790.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/79635792588.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/73362515639.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/surizexetuzunotesiwe.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfe887f00f---sulivupijimumezivaw.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae47e7e2261---kokopilirejilivapekesopo.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/2629733151.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/70506501257.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160992dc6638e4---pedode.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c0cfe215852433964f67f3bd6140a8b5/vixapiderexedadolita.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e5039aecd---417800518.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/xebipujituvuxozune.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/12556373666.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/mokasumezelusaxir.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/subovokepedenatuw.pdfIn PDF document text
    • https://chptravel.ir/data/file/84010213383.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/pepufikopajemup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=makers+of+modern+india+pdf+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94A 20700 bytes
SHA-256: b234aac219955b9dd6345728ddb52947a810eabdd3b8646a9fe8a1314ad666a8
font_01_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 10732 bytes
SHA-256: b577f5be91cc070a681714645c190d1caee1cdd9690a9ab149bf77400ebd52a9

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