Malicious PDF — malware analysis report

Static analysis result for SHA-256 40eb81e006d192ff…

MALICIOUS

PDF

98.8 KB Created: 2021-07-01 16:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f56d59e2ab1c23d5c5b98733229a27df SHA-1: 17261f0e580f99b10520b02e17a2d96c93d2b196 SHA-256: 40eb81e006d192fff6f35369b3249e1d1b8489dce455179cf40243c3594c5b63
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of numerous suspicious URLs is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d397f50e---pitisufolizalolodumuna.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/gagetofesox.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6c69f0086---80609381893.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9d919868---favuzawinanelawesaxewu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5hcseb0igf19qfu2bmjqidntv6/kotumulebexuvopupenexewo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfa77f0bd---91550789139.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9a2f0f8263b3c77e401c9ef74685a954/pewinag.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/58032478152.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d444975b7---81309503248.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/32448984801.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/77495642771.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5frlphl7t1poaq0qqm35kfjve0/33358195334.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/dopika.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/toectr5bopr6k1qlrd13qh0ji4/gukire.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/8rfbtggs1laonc2cnm5bn57t5j/xugeda.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/mowikejeb.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/vepumulekup.pdfIn PDF document text
    • https://eternalbliss.net/file/felanujadaganujele.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b2f97b91a---25880422919.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/86674296580.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ec5e3a29---kuxepewenegovejarozoves.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bb86d2c7c4300603f27148a2c36c65bf/18957496903.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/tapogofesesefej.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/k2e8trofm3hka6pmrb309vo86j/75995128211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=state+of+journalismPDF link annotation
    • 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_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_01_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 18348 bytes
SHA-256: 0e5475f45533aad30b6b08657893300a2f26d824f8edef65c1fb54eb14ccece9
font_02_sfnt_off00014d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16541 10680 bytes
SHA-256: e8522f9f424494b74f5f80e952f7c3ddfff7a0b5a3e207554e3a11964bffc7e8

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