Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b2cb47f61a23f1…

MALICIOUS

PDF

72.4 KB Created: 2021-09-15 18:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d7d7fdeba43abd50a797c392ddad6b0 SHA-1: 35b732ba65668adde7eae7d25f9d1082bbf96c04 SHA-256: a0b2cb47f61a23f15ab8d17fbc660793b2b31b21c33093df0c771cb9903a5fb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm on disposable hosting further supports this assessment, likely serving as a lure for a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=xiaomi+recovery+software PDF link annotation
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340933cda5a---16933777819.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/rejurijowepotumubewo.pdfIn PDF document text
    • http://ceroki.com/image/files/88766161000.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d9e427beb0e1d21a9f276d21ed4079a8/zopinizaf.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/robatuvigume.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/61f509c3e8bcd3413c70b08e426bbfc0/76590080618.pdfIn PDF document text
    • https://norservis.cz/files/files/439982672.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/murapapo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4842ea58---pawofepupumutepopuwakaba.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210901212117.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-15/20210915233334907685.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/95199868096.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361129124ac---42385227954.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109130052597768.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/87950396342.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/8323235066.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/zavuperanafepura.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/vugukunuf.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613020b2a099e---82818868053.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/segubijovesubaw.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf69e1932---lisunowed.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/kopetalopilop.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/5134967539.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/puten.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/65196429364.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/68278596303.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_off0000b9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 10620 bytes
SHA-256: 71a23c59bf84b9838680acc233bc63007a51f2d467df0ef504a6c6a05ba6c0ae
font_02_sfnt_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 16512 bytes
SHA-256: 52bcbea0813dd38c5fe7393b908f47ab3e5d66469869defa0a10378724fd492c

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