Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1f8df85a17e567…

MALICIOUS

PDF

71.9 KB Created: 2021-09-21 08:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38c6e8fbd15a42245886d4ef78ad5a59 SHA-1: 49d62b4e6f76c218269a3af5ddb4d42404381cfe SHA-256: 1a1f8df85a17e567b65c83c4135677604dfc10e6bdbc786a1a203b64c8c36268
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of numerous unknown URLs strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://canoto.us/Images_upload/files/54872043010.pdf In PDF document text
    • http://crm333.com/documentos/file/lijinalebotijuwoz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161417e99e6fb2---55492731859.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/giwopuroxedaraxemexanafun.pdfIn PDF document text
    • http://mcutech.net/files/mepugakevogajapusumowopo.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/wovawomoga.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/dagolosiganubugajum.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/lamujilikuneruvera.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210919_D86C02DAE48CFC62.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/47223893033.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612f4e9a13b24---94582477616.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/71080269924.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/27822115487.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/68781405940.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210903082742.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/wilujukuvokipeg.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/bupefafofi.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/memajam.pdfIn PDF document text
    • https://hoalavender.net/upload/files/wogigoreg.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/zixikolidenopetizomebero.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/29234386568.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/59095927475.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/32a60d6c08db860960e28755470673cd/valiresif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=take+off+malayalam+songs+mp3+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_off0000b707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 15988 bytes
SHA-256: 27fe684163abb8fd40c7ab948a100475321e831c9469f2d6e22df0b3290f65c9
font_02_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 10980 bytes
SHA-256: 868693d0072773dd09c311b378a6f47978d4d34b66c872e247f50c81617f17e0