Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b884fc56d11571b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 03:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b924ddc24aafaf2e526c6c66ec25e444 SHA-1: 60eb90cd8f0bd71395e7e80728860b76e292e7a2 SHA-256: 8b884fc56d11571b523555b500c80651d8e80d67dc278027fd94b249b69d8c00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. These links likely serve as lures for phishing or to download further malicious payloads, as indicated by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hyundaihungthinh.com/uploads/images/files/28198835063.pdf In PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/orb3c4smqejcol6aa20v2svpcm/69142914022.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/ralowezupu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f769ca190---mavizudibote.pdfIn PDF document text
    • https://sensorservice.org/userfiles/file/38341277469.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/rakibevepopajujawuw.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/mokoxoxubidinorotoru.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/nuxekosebaxororipuv.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/melidojoresusap.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/94184518373.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/38855877474.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741efc5462f---97107098722.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/80592319055.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0221f687---24880349940.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/voxasowikofikuz.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086f838aa741---26190254259.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d5ec1c077957ee16b5c01b48005fe935/33912241209.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b31f4b4c97543bb078c7d632b2c1ddb7/48529344938.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/96768249437.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/xatesosumopi.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f7e50bde---90412944656.pdfIn PDF document text
    • https://onecre.com/images/content/files/bajusupokamutozosede.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/11387438289.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/48684709604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=patterns+activity+worksheets+for+preschoolPDF 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_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 10936 bytes
SHA-256: 0487b89ba00c975dadba3394191929e785ccae896dbb89f98fb5781ef251ec3c
font_01_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 17120 bytes
SHA-256: d23ef88c6275c8e33c63431c7036ab29c5beb623fa125d8153ec6638d33aba15
font_02_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1