Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cccd62171e6cd36…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 19:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9b94d2485d3f5dbd02895d9ac451938 SHA-1: bd4ad36d6abaeb2d1f3a20a8b93d937b79f151eb SHA-256: 6cccd62171e6cd36c194ca56675e99e5fb4149c4a1f15e9b23ef50ff075e3fca
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm on compromised or disposable hosting. The presence of a 'QR-code redirect lure' heuristic suggests the document instructs users to scan a QR code, a common tactic for phishing or directing users to malicious sites. The numerous embedded URLs, many pointing to PDF files on various domains, reinforce the link farm and potential redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.channeloflove.com/ckfinder/userfiles/files/lemaxabafezatefujo.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/76aed70760a93a4519ff29d8b0388dd6/62910934844.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/53161249232.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/zuboxajexorani.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/565cea1a499df24a05eecc927b24beaf/lafokovutejebizedazojuxus.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/99207550365.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614649c9a21d2---nugesonumuxapenire.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ep385t252isgoru7ul027bhor7/41280590823.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/vusoxuxurumogozagiwola.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210917013610.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/lawirobuzil.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109131920205041.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/dugewizovuz.pdfIn PDF document text
    • http://labonscafe.com/userfiles/41219268075.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/liluwun.pdfIn PDF document text
    • http://ihdbd.org/upload/files/buxinudixukapipe.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614cce55124d6---nefisapebarirasol.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/zixogabukinuvadewiju.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/moloragipidovagewesifoju.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f285ae20b1---zikelorudalafigar.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/4428650823.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f2ab60255ecf60f79e86a59297c42652/zugukivavetidifima.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/relivobamizoxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=qr+phone+scannerPDF 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_off0000b0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 10296 bytes
SHA-256: 178f520cde39596571797225ce9aa08a74a1d9b11cff30f443041fd1b704445b
font_01_sfnt_off0000c80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80D 16560 bytes
SHA-256: 37b308e8540cc13c2e36769b772c4ce7eed196ee4a7237e9ee45e133d287489f
font_02_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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