Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c297ef09b8c7cd…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 21:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a59943721b5450727e4d55358c90cdaa SHA-1: 9086e3a0fb2b3b669f55ae781be5eb3ff462131b SHA-256: 09c297ef09b8c7cd5b1150a9edd7d91f8950aba11e2ffce9e9cf75b7a11d02a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=psiphon+full+apk PDF link annotation
    • http://dilimkebab.com/userfiles/file/74807442341.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/sonanibulewiwivavelopozak.pdfIn PDF document text
    • http://indemo.pl/Image/files/rojapejavejedetofafoz.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/50648559409.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/68178720674.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/42033712762.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/nutavoxawixagogoworakifop.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/wenozeferilupapet.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/pazowikuziwimavimoxupus.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/12243628494.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6835cb2a177a64d61136a094f102b4de/zefaguvigu.pdfIn PDF document text
    • http://skolky.info/foto/images/file/60560902556.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/33484498411.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/93430913887.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/3204893786.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/41411052191.pdfIn PDF document text
    • http://alvitraders.com/files/63089047836.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/17986378456131664e7658b.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/74484904368.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/xekedililobapu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/8p17caet3554d53pd5f6duv7gd/27004467930.pdfIn PDF document text
    • http://alltechsro.cz/files/36801899130.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/61070767941.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71f187da8---66792130565.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_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 10320 bytes
SHA-256: 67d56ef46500080ed82825677c8a07b013b61c3977dfb6082b86cd417f0365e9
font_01_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 17352 bytes
SHA-256: ef0ad75e3c13627c5a559d78b77c68a746dc62171a09c7fcb0b4b4b8c7ba58da

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