Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7555f956d33511…

MALICIOUS

PDF

80.1 KB Created: 2021-09-24 05:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b552f2d1cb7b23022fc225fa9a7005e SHA-1: db34054909f105f3aada82afa4720ef03498b92c SHA-256: ed7555f956d335117122f17907e87b89fe391591c143de8ca521a0be8bad4cf6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=stop+updates+android PDF link annotation
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210917_C6BFA105076AD28B.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/jamajeje.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/26167048677.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/foruradobefajigafolafevep.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/faletekibubojiwug.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/46383503249.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/rixudoxajogibuw.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/54297c778f69700286df342eeac4bd26/tuxuwetazigeviv.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/15866869866.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/71b85b2d683413d7cebed107f54dfdcc/nomorajeboxirigaxujiri.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/bupem.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/nivitazivofoseregi.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/56540439136.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/69455205460.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/vemegavelovenixudibodu.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/jazufexa.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/73565042854.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/papasilaga.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cef1ef4225---jovoz.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/vexenopalipipulusabojaw.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/fekojagegusosozupedo.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/61400831925.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/86106386843.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/novarasago.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_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 18104 bytes
SHA-256: 565016b1d27e0f52c596e85705ef39a4a5d311f402aff68f1bc759d73c69b29f
font_01_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 10516 bytes
SHA-256: 252372ef65b5ac625d35c00510e5f0819612363a84b8197b3d1664a089085b1d
font_02_sfnt_off00011b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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