Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fec407b5dd0dbe…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 16:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5eef19454473af2a98d7f18edadf1dd SHA-1: 6013fe8dd691b03cf212ad13bd8a0e0671d39758 SHA-256: d4fec407b5dd0dbedc664dd3650eef6276b43ed8014b9060571338b836bd8e65
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://abwpetersburg.com/uploads/files/livupibetifemunateta.pdf In PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/28229297405.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/73957278700.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614b838467467---35890570382.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da531613b---48285121557.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/medatejarod.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/ratagabafejexudaf.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bc31275887288909da610e1188edc855/sutilol.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/62227588660.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631688510.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109130747201899.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/xavaxorixagidit.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210902152205012341xhgzpcri42l7.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/bupuduzulimozazevib.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/31793921379.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/dukejuxivut.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/bavipokadoxabedododevozaw.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/98047994239.pdfIn PDF document text
    • http://entrackintl.com/uploads/4927130801.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090607004373499.pdfIn PDF document text
    • http://maihome.hu/admin1/file/60425556261.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/vakig.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/naneti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=baseball+star+hack+apkPDF 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_off0000b361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB361 18808 bytes
SHA-256: c1fd9a097a9178765fe7b357861c4089a5c878f31628d82a9829e1bd8234b1b7
font_01_sfnt_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 10440 bytes
SHA-256: f04030f2c4550a4e4befa353eb7eb3702a526319dca69f1602b635be244b87a8