Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12c8f22a149f3b2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 06:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79ea1eae479b80dc6248af7b5bb755ab SHA-1: a209d0978b58594571e4a5dbf23698d0bd133801 SHA-256: f12c8f22a149f3b23745d41a18e2501fc5987ecd242ca68763b5a155e956189b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable domains, suggesting an attempt to redirect users to malicious sites for phishing or malware downloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=runkeeper+apk+download PDF link annotation
    • https://cailux.lu/userfiles/files/fuvuvifaxox.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/jimugidelimon.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/50774815542.pdfIn PDF document text
    • http://melvin.cz/data/91767948216.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4b82a6ae2c282ea7af95e9687c1b9cb1/2920671329.pdfIn PDF document text
    • http://talleresjpg.es/img/file/golazazutixadozasonawim.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/54142332982.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/xipatigejupu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613618c0c1f17---96034313919.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/nuravotaliseruwitunatodul.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/96855369977.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/gibukumozapekidijofuxev.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613223ed12264---fofazamamitojidarat.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1085e83ba---209063358.pdfIn PDF document text
    • http://exim5.hu/_user/file/pijosit.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/vexiroworef.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/55882351419.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/83062476654.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf48a405b3---920682642.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/86804452961.pdfIn PDF document text
    • http://momsystem.ru/public/file/gipabekuzosadabuzesi.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/71370005600.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/3406650685.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_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 18280 bytes
SHA-256: 4167fa1ff8f86e49d01edfdd8060c369adba4d29e92604561dca24a302d7223e
font_01_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 10352 bytes
SHA-256: 0065c26fb8794adc07539b8fecfba977dd063e9f9c53e6d0f1cb40f8faf3ffeb

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