Malicious PDF — malware analysis report

Static analysis result for SHA-256 760e7fadd22450e8…

MALICIOUS

PDF

83.4 KB Created: 2021-06-29 15:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b7fd72d8597a5d0f83e916d63a3415fe SHA-1: ba52208a672d09240006261a69a4358686dde6e6 SHA-256: 760e7fadd22450e8d12527a5a54a1809983d222430450aa94c0fde5d6dc5fdca
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farms points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=let%27s+go+6+4th+edition+workbook+pdf PDF link annotation
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a20d2e716b8fb2019a1be9f7f9315693/20860236216.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d30add3b6b5ac02cd25d55a0de3433f0/zoribuvugulometujutazidi.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/vetup.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/peresonubamifesasewejope.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/aee0eb900cb772ddbb7ab02531dcbdc1/saditutepuri.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/dojibikugadojezimevitidu.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/xebura.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/66807103930.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609face9a5932---97679390270.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/cd42b48c0732bb87d8e5e92ee3b754d9/47514330231.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/191731934860d9cb7ccb9ca.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/754782214.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/zejigenalunetebogogisasa.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160727c07b61a5---35847388527.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c55eaa5a730892b4f406b3edcf1d42e3/mabomokezoteripi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/wuforobamatujepobimi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/b31o55iea0e36sp4qt1447k6h4/jaxemakebelamo.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/jjm4aj14m6p4skm9k0qph6bknm/vokumunawomor.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a095373281e---vetubuxunatomowi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffad01c62a---71498589553.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/315840ac3bc910fec821981cb9456cd7/6336956161.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9145fc7f---32389280898.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nekomowawesojepogikefiri.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/159700061160af80925e414.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/15082138767.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA5 16084 bytes
SHA-256: 4e8a04f4a78fa3afc58a57d2cac5c2e1f8bf6776ecd71fe0ca93f3ac5299143c
font_01_sfnt_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 11124 bytes
SHA-256: e2957e275c596dfd2be6889928d9478fe0c0b958deefcb56ce1d39a8ce638ba2
font_03_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 27652 bytes
SHA-256: 625b76c3ad380ad076a073a4b364cbdff63b936077405a44eb017e5a59950f49

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