Malicious PDF — malware analysis report

Static analysis result for SHA-256 b513fb0705be3503…

MALICIOUS

PDF

69.0 KB Created: 2021-09-03 02:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 397e11ea296ad06f1701e5065021cd52 SHA-1: 76d39b4d80c7754525235976a1ca91f13b954dec SHA-256: b513fb0705be3503b224812facaf6f321142307a2e530f6dcdad43a0ae268031
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, utilizing an image-based design with clickable links. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, strongly suggests an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a delivery mechanism for further threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=converting+pdf+into+word+format PDF link annotation
    • http://wahiclassof69.com/clients/874294/File/27606053159.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/wubazutolowogobulodividu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ef54158db---20403403968.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/79400528510.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/moniteb.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/089a78d0a0d242ce1bd681a518dd1703/migebibamafube.pdfIn PDF document text
    • https://blokhol.com/upload/files/luwedavetanodubemija.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b38945e14---80049599643.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/nonebojudebun.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/61449050863.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/nudipowajuz.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01008e0862---kazitevesejukebawogu.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/56697278684.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/buverosubuzufunar.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/rurabikerakurofo.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/50167975408.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719c331d318---nizejijivumo.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/77dotlf0g46lv2327tbksrvfpu/nukofipuf.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f91bdb51f---60721562133.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f6657e088211db11230705aee1ba8848/giropozezivowolawepalome.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d2aa64f4f0d30e815234eb760bae434e/xanowedi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf05235cb---27972203105.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 10808 bytes
SHA-256: 730481858f84be1aee1aaaf26c9d3568513523fdee13b60ec724023b119e9cc3
font_02_sfnt_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 14100 bytes
SHA-256: f117085025050d0740ab1f1d465d2ac6e7d784ca8cf7e64fa616317005c0de1c

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