Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73c313bcab2af02…

MALICIOUS

PDF

97.2 KB Created: 2021-08-24 19:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0190dc37047b57787e5773b1136210de SHA-1: 9f56774ef56786d314b0d82cf8bf52dffc342035 SHA-256: e73c313bcab2af026bc003230e0ba25a72ca390a69d4ba0128460869a08caa58
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or scam campaign, indicated by numerous embedded URLs pointing to compromised websites and disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests a callback phishing or tech-support scam pattern, aiming to trick users into calling for fake support or to resolve fabricated issues. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=office+2007+full+version+with+key PDF link annotation
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zakurilufuxabowitopinin.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/6ac519e538086d37173c1a54870321a7/jobepibifo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4t0a5v4lc6jjan92o07e4mmiok/1449092242.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/90016917951.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/pesuxu.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/waropuwapu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0vvb3hbikma0eagq1v44app48h/gimofumoxapulibodetakixum.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/pimofaniro.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/gugojonaf.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c5a4c7f6d8a19adcdb72f0cbc80150e6/69099458258.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/vuvofopukewasamuvolekar.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/69729900902.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57528e34c7---24686447235.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/d39vugpjutn6tkv14sd0r2gqil/44736306808.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611b446bc8bd0---bidozu.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/mogomeninuxosir.pdfIn PDF document text
    • http://elsped.hu/files/file/bunudunagozusozulapudipu.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/8651819726.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/wirepelutonaputaxosol.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7ba94298974931da0bc148d3d84c2368/nudusi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a448559d32b---92441621855.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a19df6e82fe3a792073f0067794a5570/42553108310.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b8823eb65712c9533191e2bcb02c4ece/dikijoz.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/komaviguwajokukulatinib.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_off00011470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11470 11048 bytes
SHA-256: 88ef8a04740dbb802adb2acb3d31a67881e8b74f5ac097fc0c7dc6fd3ddf5068
font_01_sfnt_off00012e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 18280 bytes
SHA-256: 01ced20dd653ebcd15b21bd62a1a14a5400f2e05d5a9c61f4938f544294ac94b
font_02_sfnt_off00015d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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