Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33dd9c32af9fa6e…

MALICIOUS

PDF

95.2 KB Created: 2021-06-21 18:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3af7970587ad149de9b86e1a6f1c6997 SHA-1: 1285ececbf4458911c5bde1712c39255132461ae SHA-256: a33dd9c32af9fa6e433deb54607a0216ce6756a77190e9ea50c14f6e68719f36
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=ghd+sports+apk+for+download PDF link annotation
    • http://srividyaastrology.com/userfiles/file/89637109868.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8f7f02b352a80cf54c09c8a4f8b1fba7/xulowelotugepewe.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/4db36cf804588080d7978386fdb7c2c0/dezosotukedip.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c62cfe4911ee5517a952c66a4a499256/63126291850.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d1922b485---mapanadogukagifu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6fa746e41---44791404436.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/benodeketomu.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/bipujokufalaz.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/92611447244.pdfIn PDF document text
    • http://adveotec.com/img/file/jozowizatuzinobevew.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/46362168584.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/rujegojisavobewisewil.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f34c83a61d1bdedee4539af0b42d1037/42635164178.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vfj1hdrs27h63ihfqe8knmu296/59886705411.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/31029105672.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/vixogujejokujepi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/25vtend9964iqddgmo9t5oj1b6/70359776981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11270 4940 bytes
SHA-256: 2b971ca8d154cb135009973ac7c28dec033655ee5754e09147bfed7c0d2701eb
font_01_sfnt_off00012341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 11460 bytes
SHA-256: f52919e2251e725fcb994d5a28ab0a50c6de652bd80fa5dc7449973a5987821a
font_02_sfnt_off00014a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A87 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00015fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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