Malicious PDF — malware analysis report

Static analysis result for SHA-256 067907ab9a1ea4e6…

MALICIOUS

PDF

92.8 KB Created: 2021-09-17 15:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 232e6eacf0d9249adddb2abf0244c7bf SHA-1: a767676c650663a6a09e1a0c3b3f89dd11dbdfc4 SHA-256: 067907ab9a1ea4e6e2e03385e7bbac46b21bcbe85105dc0eac3c7f587106ef28
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. The presence of compromised CMS upload links suggests an attempt to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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 http://w-mill.jp/images/file/vinelupujafefasuzemujuvir.pdf In PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/zivujaxitabinawugo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa010455d---bopalevusa.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/dot7o4kh6fadbspf05918esqpf/lutomupupus.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/50870929977.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/87110085068.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/24207865954.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/41114656642.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/76383682492.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/33204203904.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tosepiluvet.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/61012607040.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/12387906618.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1k3v6j8jpj1vppgq8gt37pbjgq/27107374816.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16143ee8e82b8e---40384575530.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/12892538097.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/10374591422.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/labajule.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43483601386.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/7034293181.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab5dda891---76114419356.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/036ae1fad6edec191e19c729f389c6b6/14864392904.pdfIn PDF document text
    • http://nhadeptannguyen.com/uploads/files/godavizogovoxupur.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/1914868902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=aot+offline+multiplayer+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 1784 bytes
SHA-256: fca9f8450e1a544ab43b6b7fbe967452567be0f6c717d6b9cf2fcf5323db9044
font_02_sfnt_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 10636 bytes
SHA-256: 5f6d16997b0853aa7e29085f0b94f9ef9849898b1d2cee4eb8401e08f441eadf
font_03_sfnt_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 21224 bytes
SHA-256: 9868f0e7b37480ad1631566771fb180dcb9250cae66c4ed95126ceb4f69693d5
font_04_sfnt_off00014f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F05 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a

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