Malicious PDF — malware analysis report

Static analysis result for SHA-256 44685dd0d0931a7b…

MALICIOUS

PDF

89.5 KB Created: 2021-07-20 09:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 013f4538eb8314986084924e4091f9e3 SHA-1: ec50d2c19af4e9b76b707466495117ab7aab0f79 SHA-256: 44685dd0d0931a7bd063446e397d451a3c4573755b10fcfe4b366641072a6630
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, characteristic of a link farm used to distribute phishing lures or malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cailux.lu/userfiles/files/14254898953.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a39b7a82942337a071a1b680a3ba61ee/8481623825.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/bemizulowib.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f3984a63d---darokadiw.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/17928474859.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9290baff---zozewusud.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172121384519.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/43051679773.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/25342945194.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/tavujixajodibipe.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/46322953875.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/rigakemedoveka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5ff2328f---92472182289.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/sof6a2p17pbgbvrs8kl40vf35l/93434403042.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/04c7a84b6f22cd8b309a315e92b57f3d/60572347706.pdfIn PDF document text
    • https://luminex.pl/upload/file/nogar.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b321d040d---31906986119.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd467ec2783---91866057555.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb20b3aa1---nitarizefirefevowig.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/8d15a1a6f40675b742012161066cc4f2/wegopigixiju.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///revaxovofipanuzapatudu.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e4796a0b13ac6ef1ee30c9ad46cb8692/kixazenijufamubege.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805e5b6114f---71804867450.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65f544292---regugosivikuliwe.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/selonusuguvavoforepakix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=map+for+builder+hall+4PDF 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_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 10536 bytes
SHA-256: 72f0a542be36d547599d1919b45218c2a800c955a566a4040b42bca4a24ec72c
font_01_sfnt_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 18348 bytes
SHA-256: e458a70c0de10704ef2b6639faae101f33091f8348d76fbc65b389d36940bdc5

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