Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7738ee6e5106e8d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 09:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e597611d52af044c844951cd64ddc553 SHA-1: 0a0b5f483fc8f58621eeb58a0850819d50816bff SHA-256: f7738ee6e5106e8d249aae82b19cf6e7e61cf7da76b890232a219711bbaef897
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://inwebjor.ru/uplcv?utm_term=problems+with+android+today PDF link annotation
    • http://dajuicebarus.com/uploads/files/40251378252.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/wadiwogogeteworebotuwobof.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4fd9f2c7---22335498213.pdfIn PDF document text
    • http://kasargod.net/uploads/file/doxilezadigi.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/28882927359.pdfIn PDF document text
    • http://telecycling.info/files/file/fovubabixumekudusigejur.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/59384690103.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/lotazabuxawe.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/xiwanunemijudelaxele.pdfIn PDF document text
    • http://knipia.com/userfiles/file/xukeseje.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/95461592246.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/xijibepitamiwupibitus.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/tizizufominiza.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/bodataro.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdaa0a1948---42096853088.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/66529374328.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbb918bac---tosupebisoredewilalud.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/90887400607.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109011508541903.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/dajuxaga.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/57929111349.pdfIn PDF document text
    • http://jinyezi.cn/upload/98478764898.pdfIn PDF document text
    • http://rurisnet.org/images/file/delone.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/sinoz.pdfIn PDF document text
    • http://foxadv.net/file/78534305655.pdfIn PDF document text
    • 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_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 10856 bytes
SHA-256: 864e476c2eafd4828cf3dd6db294060960739091079b327b91f2801c74a52ab0
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 18552 bytes
SHA-256: be24e31612b8bea37ed5c5f20c2446a2a85c846bec46aa01c744719983c6ba0c
font_02_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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