Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8ad82750868708…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 21:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 876fab85fe6bf0dfa7201500eb9d01d6 SHA-1: fb728a31c44207732d9a76dcc47a36047a39dc87 SHA-256: 0c8ad82750868708edbe619ad6c1e6cf93967bf846e0527daeff9924df52fcb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristic firings point towards 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://inwebjor.ru/uplcv?utm_term=malacate+manual+para+4x4 PDF link annotation
    • https://webmakler.org/userfiles/file/kovokebikutepunupi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace38018c4---kujof.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/48120916010.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/34764430937.pdfIn PDF document text
    • https://businesslife.com/content/file/mebitaxisalumekijiluju.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/66267e74bb98dd54018eed8d5e9ec1b1/46067938026.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/lezuju.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/deperifuri.pdfIn PDF document text
    • https://best-label.com/upload/files/bawubilobijuta.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8ea76ded1f069c513f487bcf87a84c22/84060830712.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/44816333388.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdf3f65c80---xuzan.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769f4bee971---90597447295.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/kelopig.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/25461771128.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/rasafagizikanewezo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0paue64l2pn3vqckq35vbs7jus/jelageragolevavedukapolaw.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6e739a91---vewipekevuwatixidusamer.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a637af05677---90717658909.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/98982975993.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zejedepokulaxibebi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f81d2e5ec---73410777193.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/kobumosarekex.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/54971424576.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-08-21-15-14-11-akuED5WE.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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 19604 bytes
SHA-256: 4f614b6633e7754342a44c0ab4e0710aaa587bae1f9ab0f71f68dccbb9a2f46a
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 10428 bytes
SHA-256: 86e9db4d715e8a1099eff33039feb1d798fbdf2d6cd2ede6a57e77d773a8b443

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