Malicious PDF — malware analysis report

Static analysis result for SHA-256 6802a32d53b0f4ac…

MALICIOUS

PDF

83.3 KB Created: 2021-07-01 15:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 453b9e37a88ccf023ee2b28e148c3ad3 SHA-1: d7e3c0785dd994c6ae30db4938f7cfe98a139ae8 SHA-256: 6802a32d53b0f4acc8282c87bb2a185e02e62ebd6f4cd3b9f8aa51e7fdc5f913
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sbs-group.co/userfiles/files/21031182093.pdf In PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/57609416506.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/60b919318d6ee497cc885cb905a4e853/notexud.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/64018339542.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bab002e7161---dofixarubasidewibiz.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67c45c13d---85579847546.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/fe8a08b0a2173df3b6bfbdee845f08d3/ronibidanarometuwoz.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/zegisivivuwizigikewemu.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/45589014377.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/90628394598.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/28414123360.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa13dbcebc---12212068016.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160974f843a70d---72276875018.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/i3laaesck4cc1i6sbg8umaeir5/72215412464.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607629f73abef---rutedipuzudire.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6ebd5797---12813275448.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/8032992154b9bf3255be0d51e84f9180/sabidobusewagurumufoner.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/72347e02d17f2676d9d94bdff2261ad5/16154684661.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb9de7d7a---bezodupirabutulesone.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8c1fdc41f---5569783082.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/worebixabikakobi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vpa1i8g8dbornseoj8vcgv2c27/65719999685.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87632d4a1c---vubadiguruzexat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=surgical+hand+hygienePDF 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_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 10552 bytes
SHA-256: abcaa7a2306c2c5ed01e037ae848633458cc2aef752c6d74e55fa82f6baa9bf1
font_02_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 16344 bytes
SHA-256: 30e1a7bbc97d0baee28a98a522f6b4eab792c087a885656513b7921c1f008e78

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