Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5faef1f79d59813…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 18:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b820cef67b1dc30fd620cc88e097f1c9 SHA-1: f75496d5028b88a7295380ad1b529cbe9479960d SHA-256: a5faef1f79d59813019ed12f91c6a48c455bec0d3991446f4f3c44f76148de8c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute or host malicious content. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://marblo.ph/app/webroot/img/files/97285035523.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f57e3d44307---71723310833.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/85602961620.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/40807785942.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1451d57b8a---monedixotinufavaxajagawu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160956751bea9d---seximoja.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/28672200364.pdfIn PDF document text
    • http://successalpha.team/upload/files/gakiriwupofewifajumunanez.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/akoms2k9c1hm7ta369sp9vtu55/50721228906.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38ca5c0827---pirokif.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/mabobabepuzu.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/70269233154.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e9c08d8f9cea91c8c601c06e4d9a332f/zupexamisubujevutegu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca8f7de19---98602418072.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/5924138056.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b873a1bfe6---73639534372.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/veduximoko.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d7cf942ba484a1cca89dc2a5747dd0b1/dawikalojoporatomiduzimud.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/918a66223059a4bade7ce2e4fe4fa489/suxukojamasukodexop.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4624f13f9---7507315724.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/mazenen.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nvaq28vp1hlatjf1mbkb952au8/rogebegawolakejur.pdfIn PDF document text
    • http://berbun.com/user_img/file/68801063588.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/polebomawasasanukaxavolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pavitra+portal+merit+list+2019+pdf+downloadPDF 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_off0000bac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DA 11276 bytes
SHA-256: dcd944baedd718db2a8746ca74da20199046d0635b222391f04d18c09f171f3d
font_02_sfnt_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 17052 bytes
SHA-256: 597fa57f5e83d3035c1b231f1440127e73ed465de054717aac4c9e10121d4b3b

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