Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3187ebbe1797c79…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 17:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5edcc1856a5faa327b0ec0918d1b8763 SHA-1: 60e8b38e390fc213390d0805522fa5f2e74c5833 SHA-256: e3187ebbe1797c79ef8737ee10f9a69541775a461301edf5f3d02eeba46b42bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm, suggesting it directs users to potentially harmful websites. The presence of compromised CMS upload links further supports the malicious nature of the document, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=what+is+draining+my+battery+on+my+android+phone PDF link annotation
    • https://tpk-m.ru/files/file/7529796589.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/59050319981.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/bisegufi.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/jasawadexenepevojizop.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pr0dimvrke04p70jdelq5b33c0/zumurelulalojepupowazaxis.pdfIn PDF document text
    • http://apple888.vn/luutru/files/buginukepo.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/34803094328.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109151426417559.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/dexemapamamozax.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/jaleposetufusejalugesaj.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/43a33330755234bf6d32f0c8b328adfd/vupodosab.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7ffda985c2fe837da8d876bb0702c9b2/1134309088.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/ferosawakizujupasosiwamut.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/57441223323.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210906075131.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/vomuvefidezoked.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/nitukujovokenikerow.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/nuwazotawiwep.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/22584873227.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/mabipexemiv.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/pukovebagapumubi.pdfIn PDF document text
    • https://robertbah.si/files/file/mixodizivijudelek.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/wapilategafuj.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vomuderegozajavunejata.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/wexerunukiximimozijowuzi.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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 11040 bytes
SHA-256: 252827256a2113831921ade5121d539a56310ef99de05371b8b7d73463516791
font_01_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 17512 bytes
SHA-256: aa26cabfeea3338ec27d531d81ddbb0d3f3cb934a84facbddaf44abcc3dabb7e
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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