Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ab74d27afdcd65…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 23:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 989a95cc27d3c1663442c0708fa2a59a SHA-1: e7247bfa7dce4d9c1b23708b1161090a78d9e724 SHA-256: 12ab74d27afdcd659d3409c40f011ac59800c343089f1ddb0ffaeff66cb3f2fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. Several embedded URLs point to compromised WordPress sites and other domains, suggesting an attempt to lure users to malicious content. The ClamAV detection further solidifies the malicious nature of the file.

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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c78839d24c9e32ae2993434328792a0e/juxebuboxozadexufa.pdf In PDF document text
    • http://sportsclinicwest.ie/media/contents/file/43818100130.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/maxubufowur.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/penanuzevawet.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/85589655524.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/gumesije.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/22650666018.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4f0b81ea---20236366108.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b32c262f---71481821555.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/fu5qpq0jauipkeuqceh8ft632e/61930945169.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/5bevt3opeei75cchag2ue6v6s3/nogum.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/fekalosiwefulibobidezi.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210911_200440.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/wizuvarugawume.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/2083496252.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/34125465207.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc6370c9d---20762598815.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/98egil4mqq4k48mqpq35hsj1pt/50833801010.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/zibejepowasesosafapa.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/14782618257.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/14324276094.pdfIn PDF document text
    • http://nscenter.cn/upload/files/92970675033.pdfIn PDF document text
    • http://islandpointfl.com/userimages/13754956276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=miui+12+poco+f1+stablePDF 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_off0000d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 17944 bytes
SHA-256: 1d8e718f6fe52ee875101b13710d4293074a8ae15a3888239e73be97bad91ac0
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 10672 bytes
SHA-256: 41d7cec8dcbd876d8f1584a8c96146f6b31e387140fa8bcb163425854c7f5b33
font_02_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1