Malicious PDF — malware analysis report

Static analysis result for SHA-256 845a416babac49dd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 18:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 704e7bacd72724cc06d6a386a8068af2 SHA-1: a361d278b6b285ce663f1995fb2cd2faf8e1f48b SHA-256: 845a416babac49ddb92df0458856fab24eb99e2d63a0a0a986448b7a21558887
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=games+like+asphalt+9 PDF link annotation
    • http://dentherapia.hu/files/file/darenilamuki.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/wutetujikeluwazifujuxu.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/49482573662.pdfIn PDF document text
    • http://splogservice.ru/content/file/xofizubufudozinaraz.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109110349034092.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/nufekobiwosuzemusebexi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/oalahr8b5u9c499p9qk5emm4a4/77408936868.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/bosevudiwonavogoboki.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/wesiju.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/48023422225.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091821594273499.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613512baa8a6a---pisirokevabuf.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/68661391492.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/nikigumov.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/gugopizobopimatuv.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ffa14a15---37386794603.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/fafupefet.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/66e64e46c9139677df3b7546773eba1c/71634949391.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/jekufoxerinim.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908233401783364.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/77880200085.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/69395903292.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e486b429---47866199276.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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 10492 bytes
SHA-256: ac6cc8bda0c2e243392a8b7633b3adff46fd6d4fd0fa4112e6694cea5a4fc936
font_01_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 17388 bytes
SHA-256: 42c32a5088ecc17585cadc897817914023e1604c56094ba41c9a8c75b9441b65
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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