Malicious PDF — malware analysis report

Static analysis result for SHA-256 7789bddecef32614…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 22:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6af99cfd0b548f6387abd999fdc8ae66 SHA-1: 48a045cf4e9ba1ca9397778c7baf370d6bc2fac5 SHA-256: 7789bddecef32614a61ab533da83903cc77b2264c479e0ee77276087f46ce958
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=home+design+dream+planner PDF link annotation
    • http://savvyais.com/userfiles/file/40694495959.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f014ce5f39f41805a11597b45a5645c4/wudorufokum.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/pifag.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/19455880951.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/pubejevegefiva.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/neforuwipugoronin.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/zevamakuxo.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/sevolovorelafujobe.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/58840812765.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/pazibexemubot.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210910053542.pdfIn PDF document text
    • http://word.mn/uploads/assets/91352117977.pdfIn PDF document text
    • https://kenadong.com/contents/files/godinikefiroruwu.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/buxudakalotixomokej.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/364f0e0f5f7bfa4b2403c9fb29c9fa58/57542526202.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afd8757dc9---riketokedumuzikanige.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/4583534335.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/47216309785.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/46259819082.pdfIn PDF document text
    • https://insp.biz/img/file/79646409701.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/36289581213.pdfIn PDF document text
    • http://land89.com/ckupload/files/15261121459.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/40216219119.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8c3c14ccf---bokumakepujonebakugogub.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/99103475183.pdfIn PDF document text
    • http://orenprom.com/img/account/file/71390555158.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/54388265292.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/baxafilos.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_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 17180 bytes
SHA-256: 9daab6808b9a5e6886b2bb023bb0f4e976f8c5cbc6f0f48123c55f86dc010e31
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 10628 bytes
SHA-256: 441bc6f4886eb95dec13b1f0b52af2b55f1fc4e6240a50f2e25a1482f09bb995
font_02_sfnt_off00011528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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