Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d69d97fd058600…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 06:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16e91db2bc0f01dd3e47059b0350bb99 SHA-1: 439d8e221a9747e57c87335d5d673190bbaf0e01 SHA-256: 88d69d97fd058600cffdb1a80a84bda52a01a8dc40dee239f5e376076005e6f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations. These links are presented in a manner suggestive of a download lure, indicated by UTM parameters like 'download+resolution+changer+apk'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://allytemp.ru/uplcv?utm_term=download+resolution+changer+apk PDF link annotation
    • http://faisaltowel.com/survey/userfiles/files/tosadigamevavadixudesag.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/68345007680.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/62982072438.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/gokaxukemanivu.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/25742595709.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/14515390741.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/63677240160.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/batopesubotovugef.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/nonitu.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/19450173543.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/geturiloxumugevevabibu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qj7svf63kvi634c0e9jfo0n6m7/dixupasudanejonadoxatavu.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/91956145028.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161396e26beb70---batidakos.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161363daa95159---duzisipupa.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/jenalutowafazaxolal.pdfIn PDF document text
    • https://rajakedua.com/contents/files/nizuzuduwarikuneli.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/zudipanotine.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/tibededogopusivofa.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/75214426662.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/44721698711.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/b1505e0118b830070b5bd103af6dd1ce/palaremezomudiguxinoda.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/88487913830.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/53679829499.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/xenedotumupufa.pdfIn PDF document text
    • https://betsin.org/userfiles/files/vexuguguzesaxafafovedo.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_off0000b5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A6 14476 bytes
SHA-256: b0e3ac97fc9a5f43f3db12bff54e834cc4f29a44360b1c82c4a8d52389e8ec99
font_01_sfnt_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 11072 bytes
SHA-256: 8af67d66a7439db801f6ca4da434c24d8e368474b05c452636c1ce96c8b0bdf5
font_02_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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