Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8dfd221a4c31a41…

MALICIOUS

PDF

126.6 KB Created: 2021-06-09 05:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: fcf9a7b089d8a447c962ab8c41f50daa SHA-1: d1e86e742f6e17c79d5fbcd2584cce446ca79ff6 SHA-256: e8dfd221a4c31a4175075dbf321a05b580b376e49aaa9f2b48d79d5b6ad1666b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=attack+on+titan+season+2+episode+13+dub PDF link annotation
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0a724ede96a8bdb1ec3aeb3395d0b4c8/66083178979.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16092cf5d78140---nobinumonomadogusa.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/g135jpmkpbiupodl576m5o9kdt/xolixasabu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607277d8a9361---34129902382.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77340e820430b772ef7f12c6de7e1595/fefenuguwab.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b16a4f2b037---86524523940.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07241833a2---65264694107.pdfIn PDF document text
    • https://bselink.com/userfiles/file/68444223264.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad906ad9e---82585080116.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/53974937141.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/661ap1f6orbgi0tdl1d3ugmlbr/fisasiwawupofinawegubad.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/besogofepotesasoz.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021523935147331.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/fca874674dd102cd64a506dc8ea14a54/48009386359.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/3f7501b158add8c99e3d248bbd8311e2/kegodobijavirifanus.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/60rjcu76u07jnd14vt8f246rat/16671482037.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105140534484380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D9 30900 bytes
SHA-256: 2dfec8839bb903150706ef3d2e4961ccb679b3269c7f4b345c00bc91c7ffb643
font_01_sfnt_off0001a6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6CA 5360 bytes
SHA-256: e090761e7fa57309f8f5f0147741167142725f2976f9706af46e3be0fb4b332e
font_02_sfnt_off0001b90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B90F 11268 bytes
SHA-256: 25f1886174af254d621a1323f1c1f30d2f1e0453dca17ddad7ed22a7a3b115aa
font_03_sfnt_off0001de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE98 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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