Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a38bbe35bc64c3e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 03:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fffb0de6874b34cadaea4b421df2c6ea SHA-1: 2586e5c49b6d1191f5161661ccad3e7f183f7782 SHA-256: 0a38bbe35bc64c3eed464de7d45b71a1ccb87927f1768d30356c380a41f41f7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The primary attack pattern involves tricking users into clicking these links, which likely lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=android+hotspot+port+forwarding PDF link annotation
    • https://zlataraburmevuckovic.com/files/70940287290.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614cff554d5e7---3893666045.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/57420329608.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c3119a0d---bataxewomel.pdfIn PDF document text
    • https://labelmarket.pl/data/file/batadelinozogixotaki.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/turitotekegoge.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/tafegaxilisada.pdfIn PDF document text
    • http://nhuahoanglong.com/luutru/files/28041566776.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/30152181859.pdfIn PDF document text
    • http://capital96.com/userfiles/file/niwowofowemexumexax.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/35275759786.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4e9259363958da6f2a0512907ea79d9a/57723865653.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161323ce38c4bf---vutumurikureven.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/jalivoluraposanijew.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109091626373277.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/nufaberulegem.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/50983295178.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/badadub.pdfIn PDF document text
    • https://htchninc.com/d/files/vazif.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/74998736205.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ccaee8d9a---49423481207.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210924_083017.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/vatoriwonikekume.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/15693606490.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/9630429587.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_off0000b668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7A 17204 bytes
SHA-256: f581a6579c924b6252e91831fddb6c196f8ca3a6c85772097d0d5d4c9aa94ed7
font_02_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 10668 bytes
SHA-256: 26ab2973235a9a27dac8bcb83e56f37452284172915607ced5d885a587898fa8

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