Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacb4fa89b6fb519…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 11:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 94ed8fa0d6f718d5313adf273e7c8ce1 SHA-1: f226dba01f86267648fb62e51eb85b8d1e1f2f7d SHA-256: dacb4fa89b6fb51917c5b43cab7ea10837c7f936ea11e5f74b26a6451d8fa5be
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and uses a visual download button lure, indicating a phishing attempt to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear textual content, but the presence of external URIs and compromised CMS upload links points to a malicious download or redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=simple+past+tense+regular+and+irregular+verbs+exercises+pdf PDF link annotation
    • http://smartpaintingplus.com/userfiles/files/wesutopoxiza.pdfIn PDF document text
    • https://kuepancong.com/contents//files/donirikelinolunozal.pdfIn PDF document text
    • http://zgic.ru/!upload/files/55616016203.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079382f34953---2261445632.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/o5a3unb392a8dgp55rimh3g2g4/34651330718.pdfIn PDF document text
    • http://hydrem.ru/images/file/662310763.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d288bc3d3f---36070577655.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d98eced6d7---sixaxokufu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df01e48639---82748030362.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e7c6df73---wotafixufam.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/cb681bbe866628a1f414ede2c448a00a/20869213584.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/20726588012.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/22809412396.pdfIn PDF document text
    • https://sanmall.ru/files/uploads/files/19551081061.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/4627174304.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9cc10c78000c5df8f01e7e36fe1122d3/93252493917.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/33543239845.pdfIn PDF document text
    • https://camelcarpet.org/d/files/19583620646.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cb4562b6---xokovaxig.pdfIn PDF document text
    • http://siembra.me/uploads/files/fijezafesidatigobobomen.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/73433758688.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b3f48aa1aa2181d5a8d5c76ed34ded4a/siketiwoj.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nd08v7a14f3b1kvpu8cfo1dum2/vibewesu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8178d1cab65423a34513ae5e2add0c7a/luvotumogara.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/dawiruvafatobepitetik.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/97976939681.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c0f5d99c7f25bdecead1168ce27188cc/35090295421.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_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 18464 bytes
SHA-256: 03acf9ebd3f395dc873f6656864f83f35a70f63323e610178d614f5070122fb4
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 11324 bytes
SHA-256: 643f00f1cd70da8216badc1fedff8121720ba1d732c61bfcc3a67c52d15d2a96

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