Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa85c87bacdd995…

MALICIOUS

PDF

90.6 KB Created: 2021-09-02 03:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e79d82ca666190038277f98f5927e81a SHA-1: 7bb8e2e802a53d9c6c4104aa3cd2649caa641ce9 SHA-256: ffa85c87bacdd9952071844279cbae3bfb739f78acb8a19f1301b7b9ed45da80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, many of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=the+old+man+and+his+god+by+sudha+murthy+pdf PDF link annotation
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b14c6d421---renirulit.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/a19659e5667ce389d7213d832c57ca5b/zulujamerofakuzo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c057f5cf1a4---nefisowip.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/sisinipax.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/ripujokerejebawo.pdfIn PDF document text
    • http://szwygs.com/upload/99481897776.pdfIn PDF document text
    • http://honghuibio.com/d/files/mofogozamaperowo.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608649a5625c8---39366652964.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16088bd9446516---nogoligutowererisem.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160901f3bb6608---zugaximuwusamufokidasi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f39e3a880eb2387c129a5d731c8d7302/dukadefabojoga.pdfIn PDF document text
    • http://logicamail.it/draft/media/mebupaponuvufuxuwixipuvup.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a821991c3---fogerexavewoli.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/768c23bc4a529927cde77a5489196c16/36008653289.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/17451306778.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/rotikisaboberukitiwipuba.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/damikob.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280126859a---vogavemopama.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/7986909678.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b04b1997304---manuwoxeze.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/29360546033.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/24955201752.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123460e1a599---11284772913.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_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 18532 bytes
SHA-256: 80a45af80af7b8e3b3c8599d519f3f0389c7cb950817db6966077db952ec51f1
font_01_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FF 11260 bytes
SHA-256: 05b94f440109ee4c21a1ccf0708b097410f103d85771236fe57e013e79805603

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