Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd811ea574588f67…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 14:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fad3b7c679ae96794aa4bafc8429d7e7 SHA-1: 45047b01fa9cf2c71f80535183b418a1f614f297 SHA-256: dd811ea574588f6784047ec09d85a210526b37fd9a2a4857722c3b224bdb1685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to exploit user trust or curiosity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.jobsincrete.gr/images/_user_na/file/9836412770.pdf In PDF document text
    • http://robwalker.net/fckupload/file/solavuwuvumebafas.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc67260f90---48100543078.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/8572245671.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/mebokusojupevupetajapoba.pdfIn PDF document text
    • https://artbynela.com/uploads/file/39102622799.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/pekiwutujawokija.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5ccc276a670445d6b90a26ba61873356/2239242598.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/fupefibukumigukolojo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9921dcb15---jujuberajijujuluwajel.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/68392551721.pdfIn PDF document text
    • https://bataretak.com/img/files/file/magilumizufepidorataperuj.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/selibivadavekujavi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083b43c331be---tekefuxakafigatuwasu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/198d86bc087bbfdf47db5a74df73d2b4/58379793754.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/96570120490.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/dozefarafutulaso.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210810162861635941.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14299757519.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/bolubefadezesojabos.pdfIn PDF document text
    • http://kiraat.org/resimler/files/41323902117.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/cec666a3a703451853875b8f6bac7596/42026660267.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/b9d452f6d99e39f6ad3e01c2c24ec317/74671378113.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/gajoforekegafujidonunutum.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/76001552331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cubits+to+feet+conversionPDF 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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 18112 bytes
SHA-256: 98212e70af26516436096932bf94fde1ec647a0c0497ad3385e48778e1e86f7f
font_01_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 10456 bytes
SHA-256: 55716de217454595475e706620e79fc76f4daf0237d7a42532f5816cd888f6a5