Malicious PDF — malware analysis report

Static analysis result for SHA-256 036bed2770309733…

MALICIOUS

PDF

72.2 KB Created: 2021-05-27 14:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1b2994d4e2a5cc889649b6b193eb3e3 SHA-1: 7678c64f3b357d62a1973db0cffbef62339ca4d4 SHA-256: 036bed2770309733c65e2502936eaf930d3a353113f3f7d2637264bb3643761d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or using IP addresses. The embedded content, though heavily obfuscated, suggests a lure related to contact lenses, likely to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://cesishotel.lv/res/wysiwyg/file/15044629725.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/b5oth8nkib07d788sev8tfif1c/runirubepakosu.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/71793066187.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e1457573---zulaxerigatijuvulusurose.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607658c25322c---93189129472.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/761dac80c9a51a03ed08976380dfe599/2737217828.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gt2j2veh23bsjkon1m79lm2pc4/xuretugamiverovin.pdf
    • http://lab4050.com/upload/editor/file/lexipibofuv.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/t1d0ltlfbthk0crkfn12i5tuv2/30147266931.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d7e05e79---mifuzigasukolagomo.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e5524bbe---fexewakupekilivatazamat.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16087f7b495f1b---29303121054.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/064f3ccc16434ff0aa6ecc797f4c8cfe/mebadedilerelefisigoxev.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ac4b4c3b---xubima.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc8089bd76---ninugi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=are+biofinity+contacts+extended+wear
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daeb.bin
d76d0871bb08d3877afe73c1b23d897fef908b6cf30162ae5f2d0b6d34603635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 5376 bytes
font_01_sfnt_off0000ed5e.bin
bc6a9f24b7b1cccb432e59c82ebd9fdeecc6e9a9420b2b007b6ca944a42ee171		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 10648 bytes

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