Malicious PDF — malware analysis report

Static analysis result for SHA-256 d400b83fc1e8e643…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 03:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fda2c8ee99e15b5c6de2638c7da6b77 SHA-1: 064922d8213d245fc061e398a2e2da0c7866b5fc SHA-256: d400b83fc1e8e6434f3f0a138e419bc2b19c76249d631ff45357bd56c1a4b09f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://queure.ru/uplcv?utm_term=write+a+balanced+chemical+equation+for+the+reaction+which+is+used+in+black+and+white+photography PDF link annotation
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b699b7b435---sisifutuso.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ee7cc814561ba9df66a0caa9f110ea47/kaxafodaxopisukunivisi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/485aa5c362a2e7c26df1c9401c724998/45193763733.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/25ca40c1ad038cba6d7d13320e4f2f25/bapopom.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e0c26e95333a4de0530c5d45b8f36ed/58974098408.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a692f45b---52422611785.pdfIn PDF document text
    • http://hkacca.com/userfiles/sejapawabukakate.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/97730034132.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/finijitozitol.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e446ddae7c9eb80f87c0c28b2fdad1a1/ziroratafokajanuluzomugax.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/ranadugiferomowonoti.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/76779130571.pdfIn PDF document text
    • https://asken.as/bilder/file/gasufemo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079aab1c8ec3---zatogorabokonutu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1cc5a19cfd7ec8f6defd1ebb8b5e7d65/94982252677.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/15395598928.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/29407230160.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/wujugub.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd46db9bed---barudebidivejuxazizir.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7fa447764---68527069600.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/cd5fhq7e0hkdss0o4criaggp84/mudofefubabib.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e663f27a62e584108d61ee09e92a7bbc/30076842372.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/14131812439.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb18049da7---12410179117.pdfIn PDF document text
    • https://invest.pl/userfiles/file/94244053189.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_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 17680 bytes
SHA-256: c8099d51b0cc7701e86e0ba430662a24065a4c710845f3778dfb158ffc4e002b
font_02_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 11736 bytes
SHA-256: 78986a55bdc51e7cdc5db4fa43e618e8c190c17701227643009687ce58160d83

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