Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae9fc9499209278…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 08:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f913401c55579770c630532f0d01bdf SHA-1: 6536b4cac5a36b67ac422ac46b2bdb76e170c01e SHA-256: aae9fc9499209278fada77d2e4e080c94949dc1b7b7fdb566b07d572fb21aa9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=usb+audio+pro+apk PDF link annotation
    • https://galerie-louise.be/userfiles/files/gokuseruxejigisuvifatuz.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/5523062787.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/i2q2q8a79m4so7otfrr322tj00/vikifokiremita.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/zemojesiwiwu.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/69667334384.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/33774434735.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/nabaxaxatefo.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/noxawuvuxo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fffe933eb1---93729188006.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/salobip.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/pamizovogagok.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/tejixajugeka.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/71160002396.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091263014_687816353.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/vojilakavunujakedamofo.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/wovuwuwovotopibitibalomaj.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/zesusijukiwovuwivo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161465dcd0fee0---mebivupurawopuwenuzumiri.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/jubefifubakesekakukejos.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/81129648237.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/lazavosadaroto.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/wonup.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/68253193175.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/balivuwozi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 10344 bytes
SHA-256: 50196e8ad93688a317545473ef465fd2ec2f34e18a71387ec42337abe7ab6717
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 20036 bytes
SHA-256: 79856c766f6a1d4e4708c79fd2189206e465eb2eb518f9b5f64dd824cfdd08d5
font_02_sfnt_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000141fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FE 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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