Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac12ca56bbcaac3…

MALICIOUS

PDF

70.1 KB Created: 2021-09-10 14:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cbd8f9a60de2e2d3952a95905fee638 SHA-1: c8364582b8600d0bf8fb7ec62b52ddcbe1d2042c SHA-256: 2ac12ca56bbcaac39c2b1e31a9bbe24c7b3f167793580d512bbee09cdec86cb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further payloads. The presence of external URI heuristics and the nature of the URLs point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://smidgel.ru/uplcv?utm_term=best+theme+download+for+android PDF link annotation
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023d8a3cef---55764519611.pdfIn PDF document text
    • https://triosms.com/userfiles/file/kiziwetiwuwupowemodumu.pdfIn PDF document text
    • https://pr-dienst.ch/file/12498551674.pdfIn PDF document text
    • http://hzqzg.com/d/files/zidonesixubufelebe.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/14835321196.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/xizudowasevuvozazipifi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312216b4323---vapixujaribat.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/64515241669.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/7205530349.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/manivabuwelobexun.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/batanosawenolovad.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/zunazixi.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/zepedoluximexin.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/gegazera.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/dutekemaba.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/vedaxegogebepufuvesa.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/67853005885.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/34203235056.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pq89dspfjfb5shr3j9mupgbfe3/26012434944.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/fororufunifijepuzemi.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/94492231784.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/80925297784.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/bakafisuno.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/82948959710.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/20866730102.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/vuzaxivogibozuzu.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_off0000b50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50A 10756 bytes
SHA-256: 32bf901151a03f160642f88a41243879689ec28718d0a58c914ffe15ce253599
font_01_sfnt_off0000cda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA2 14592 bytes
SHA-256: fa0b4588b2d7ae05ace0596f4e0e5cc759d8c6fc9b3c8e63854792f4916f1ea9
font_02_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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