Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc543c2ffffbca8…

MALICIOUS

PDF

89.3 KB Created: 2021-09-09 08:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 92eacfb65d8301d668b8f3ebe3587a90 SHA-1: 4bea0b649c9e7306edf39eaea49881e7588d183f SHA-256: bbc543c2ffffbca8c322a9ac32341bc88fb1295b944f49bac43072cb0ed11d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://emekyesiltepe.net/images_upload/files/garizukirogimefojove.pdf In PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/95848955164.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/83071848093.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/pitepoluwusetujofijalorus.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/44749788714.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/nowefewabagedadus.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/69164300472.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b0cd8e81da0eaefa5f1ac1b1b045dc41/jizosugowesi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572f9de616---numurekogoridepulapet.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-6/20210906223325971286.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/munuzepi.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/8345108224.pdfIn PDF document text
    • https://arerp.kr/data/file///9975350981.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/55089468219.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/jageretujaxirudoxosutas.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eu1a5nobrqv63oe4iqt8vndjp/4242919640.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/pewozabevuwidu.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/votolupixibirigev.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/50345643099.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/saxolufenerusuxowajuwulu.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/5161546199.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/dipisibamuwiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=life+of+pi+streaming+servicePDF link annotation
    • 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_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 18056 bytes
SHA-256: fa22b68fbec6069355e1734d893af66031f50ba6aa6ebdd035faa50abec33455
font_01_sfnt_off00012707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 10800 bytes
SHA-256: c7ed9a5d1318f2b0f1d7b5eb941932d33df3e69d6c458a21dbf3bf4fb983d963
font_02_sfnt_off00014000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1