Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc356fcfc844840…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 04:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd465957f695c1ddd36babc1413695e7 SHA-1: 6a9f8330a92befdac977d93758de3f9553b6b26a SHA-256: 4bc356fcfc84484013356dc68f9c7904d7cfccd0f8999cc04ba534261af36f1d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=octal+number+to+binary+number PDF link annotation
    • http://vamaconsulting.sk/userfiles/file/rakekigina.pdfIn PDF document text
    • https://keongracun.org/contents//files/54278008774.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/5463095536.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/29560980357.pdfIn PDF document text
    • https://maisonforville.be/documents/file/bodusipewodap.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/jorarosuxoradawilipenix.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4890863a27c1dd993c15327d7c5d4014/73827851493.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993d06d73f1---67019515925.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/20234178365.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/vawawofumevebow.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o4ickvkv6psdf9q2ccpnt63o85/29114907657.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/77742075782.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b0ac320e2bfa066b990542b380c6cd2a/mofudabosa.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/bubaluguvag.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0af82f05e---74619835874.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1628039038.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/xubojodadozelabejokoxutix.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/sewuxadopofu.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/pogabezijazetatitax.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e35566341bd5a4de168fc07913a35387/sakav.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/57471897277.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/57089038058.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a6827af12---wazar.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_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 18892 bytes
SHA-256: d6a5b0afdcd7f0a5d226dbcad1baff027fa6657a9d606b0b7bf3842f29e69350
font_01_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 10604 bytes
SHA-256: 2fdcad0873b3b57e52a6a8cb88a3a0268535b0812185669647b17508ee1871d3
font_02_sfnt_off0001320c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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