Malicious PDF — malware analysis report

Static analysis result for SHA-256 144baee5a149c621…

MALICIOUS

PDF

68.3 KB Created: 2021-09-09 20:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2fe169401a1c356de7b05213fec159fd SHA-1: d1a04d1e56305b9a71fe0fee685d5ecf8ce1e2b3 SHA-256: 144baee5a149c6218926fb5ba82386cf0b6748a309fa86ed22518157abc87df4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The document body is heavily obfuscated and appears to be a screenshot, a common technique to hide clickable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=play+games+online+unblocked PDF link annotation
    • http://baraanduliaptti.org/userfiles/file/62363031950.pdfIn PDF document text
    • http://www.polni.si/Images/files/sufekakexojenufapezofe.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/molepulubobekun.pdfIn PDF document text
    • http://itena.si/uporabnik/file/jiganimofugutalimovenev.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/45525374284.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/gevozodepipironomalizimaf.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/gezudurexowisibovozeb.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/89636930560.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/28865188462.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/59520425315.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161355a77949db---tonemamosutaminazaletux.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/56649055539.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/59168108126.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/84277013246.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/pulejuni.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac4c23696---wumubisodijudafexob.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210901_61AA676B86E28159.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/59199417203.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/tuxifedilazus.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/36175157755.pdfIn PDF document text
    • http://grotech.in/userfiles/file/94951753707.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff061028e---27804127447.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_off0000af4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4C 10964 bytes
SHA-256: c777a581e1b18e6ddbb2fe57c65eeca264a5338aebf677b274095332a2b3445a
font_01_sfnt_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 14028 bytes
SHA-256: 0b6ba64d7d911963093421922018d031aca634d3f0c023e4c29d0f649e8b5c68

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