Malicious PDF — malware analysis report

Static analysis result for SHA-256 913b3132a37a9511…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 22:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 613c7819e2f4fb19e65f26b67680e333 SHA-1: 1b076aef2657f2f769d117ad33d391c155c7fb46 SHA-256: 913b3132a37a9511ddfa24733742b535792c444ba80663f85d6f59f175c8d37f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest it's designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079087eef35a---xajobupugapewej.pdf
    • https://memoservicesrl.it/file/libizina.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/imcdnuqa99j700ol6acl4kb509/51400910521.pdf
    • http://fitviewer.biz/files/file/31913567607.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9at7i2lq50ccmvbjhl25dks06j/givaxiwirumamafatime.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3f13d683---86430859903.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/uvibmkkott925n99neh6tcidf3/jiwubakem.pdf
    • http://enotecagaribaldi.it/userfiles/files/80768444278.pdf
    • https://actorconseil.com/files/file/48567150514.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a497a93dd---34115378123.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/pqs8o9n5s2m05isoonvr0ncq00/vawiroxetapunekemijij.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607288968a5e0---71107297631.pdf
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/49042492601.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0959653a1c---vatenif.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d4e8455c4d665b1aaf9d25c92f59087b/divizolupoxedime.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608580b07274e---mufujo.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1db056e5---wegosetuxojusuxax.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c6ea6be1d---69242128813.pdf
    • http://animationcoach.com/userfiles/file/dokuseraxopuvajofanak.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/xufulerawemovugumivuv.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/5617187456.pdf
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/vojoxib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dirty+blonde+hair+with+green+eyes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d4.bin
ab3818660c88fa37dd8d14f39166825e5470f4460a8912e45686a2a28ddc3b2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 16808 bytes
font_01_sfnt_off000113de.bin
cd16de46e10fbfabe2f1f07f3cdbed506232468704628174722595302c9b5775
pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 10868 bytes
font_02_sfnt_off00012cc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 16792 bytes