Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b7029087844c7f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 04:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 20a439600346a15514cfad56caa70baf SHA-1: c51625d04852f66f8e9621ca394e76a7157d53c5 SHA-256: 80b7029087844c7f9a80da7e6ec4467697715e1290c2df369dcbad6e6de3ac33
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://studiofantino.it/userfiles/files/ziraludowozudupadijad.pdf In PDF document text
    • http://brcassociati.com/userfiles/files/ruxufuwofimitugo.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/rabenitotudow.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/87972820818.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/64159850510.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/69660653902.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143790c10b21---43192997496.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/35054914666.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/45783390381.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/27272873816.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/85689173805.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/mijonijavega.pdfIn PDF document text
    • http://crm333.com/documentos/file/99031056105.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/jevimerebopufofiwugisobuv.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373df44c46a---80897414385.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/xetobezuripuf.pdfIn PDF document text
    • https://netpage.info/userfiles/file/34624848262.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/zesisonofikesariwiwomu.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/zivanagafeja.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/saralapusafinudiwoxubizu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b99bce251---48246252605.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/17103511490.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/28175512155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dbz+kai+apk+downloadPDF 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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 10268 bytes
SHA-256: d9c41c6fb3a1d8b87ebf6ab5ca73089df18e969828bb67873e1cf2000b247b58
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BD 17232 bytes
SHA-256: 8a4f6b498889a7337da0db1c1510689bd26a95063017af3ed544c0c68f3dc8f3