Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1164276ee19423…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 20:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: daf3f13df9a2ea9ac36bfb241b8efb72 SHA-1: 7d547357f5ebd14c484c04c56a015f5373b371cb SHA-256: ab1164276ee194234d4ea59a3b799dcc49e0658c82a09c5d9c5e663bac818fc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laatjehuisweerstralen.nl/upload/file/30371250755.pdf In PDF document text
    • http://hodinovysoused.cz/upload/file/22948313839.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/16728367224.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210902050737041762hozuddcstkj3.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/53196918415.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/74337361755.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/gudelefodowuluzal.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/84dc9853f2c99b321c61415976f74b51/30249818302.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/46166875101.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/54160135286.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/wefiwejexumunegefifo.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/vomutejoworubuxomur.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/506p4dq30f565kbkc222ducf00/97386145975.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a2992cbf32cf14408a863aa0a5dd15d9/71381348024.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/zoduj.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/83904024698.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/45441210625.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/wifune.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/15699404369.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/zudidogusilisuxaviveno.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210907004936.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210908_033659A06E7E341A.pdfIn PDF document text
    • http://zkpower.net/upload/files/dalezotaparusejejewefinab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=la+divina+comedia+el+infierno+pdfPDF 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_off0000d513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 18880 bytes
SHA-256: 9dd2f8f61a16ce82c9e5693f2da3f07f40e1e5edf50c912a062b713b4ec281f6
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 10540 bytes
SHA-256: d524814253ea5b0101a161e1a911cee31b7d231c8f323f63c6bd00f21c2fe5f7