Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a49c08b1cc278c…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 15:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9d56e579d6731dec37f8301f1c7df3c SHA-1: cc1eca2b47934c88a5e611154a4797ca0896bb8a SHA-256: a1a49c08b1cc278c16ab61d7fdf10b31435991fc1d5a31136031cb541e6a6f9d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://amctop.com/board_data/editor_img/file/202106151352.pdf In PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/42159424113.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/zivebiwemilewalufadez.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/35387924370.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0df71a4ef2a53156c96e9186d264cda3/3128646204.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/59582958792.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/gugisenu.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55781099941.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/narikelijemexowumi.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b881f187c31---laweguliponuxuvolomogamo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2e113d5766022fad6258182a360c298b/49986614305.pdfIn PDF document text
    • https://noddy.nu/images/file/sukop.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bef1463c0---31100774506.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/17/file/20210717_072354_108.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/70712938156.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/68785450726.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/zivezonuronixetixenewuka.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/42920946238.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/84076353277.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/kosarofawunepubasakim.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/59142051086.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/pp5n81anh87mu6v7b2avjetkms/julexozasejavo.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/tepuvemokulesetebikuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=html+and+css+templates+with+source+code+free+download+pdfPDF 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_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 11064 bytes
SHA-256: a9185a0498f97e411cb9c535151305c22fe15e117d28dbe9d3f9b23544e3570b
font_02_sfnt_off000112bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BB 23640 bytes
SHA-256: e99e89c6d24fa6324c06be842b219dc7781dd5099f4d6ab3ab36d866817a4a56