Malicious PDF — malware analysis report

Static analysis result for SHA-256 974cd3c440d1f25c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 09:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8f261710333c2f3c133022b179da0ab SHA-1: 85d0d40e2016f399391a659074bafcb2b989cb69 SHA-256: 974cd3c440d1f25ccd40a1334fc1e033f125f02ed5ab63c2e485cfba2dc2ea00
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://speedwayinfo.hu/uploads/file/22765569676.pdf In PDF document text
    • https://mercerapparelss.com/userfiles/files/79473030878.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/58037966592.pdfIn PDF document text
    • https://landi-bg.com/images/file/pipopojozolome.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/lexututixirow.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/40420259111.pdfIn PDF document text
    • http://regmac.net/userfiles/files/67913294989.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/sekenik.pdfIn PDF document text
    • https://aksusu.com/upload/files/7046116654.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/dilozofasulosevorexagemak.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/zutagaxajepimujesokumisim.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/95226549586.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/65719617133.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/27389810633.pdfIn PDF document text
    • https://medius.sk/userfiles/file/juxigifa.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/84857748937.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/05/xivugimepobosisamami.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5ec3cc1f---76063477479.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/matisezagifizokun.pdfIn PDF document text
    • http://chayka-svg.ru/files/bajitefipiseposijigojawoj.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/55816674470.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/67029563712.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/kotezikex.pdfIn PDF document text
    • http://builderall.info/userfiles/file/velisanisalibakixi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161418ecc9dea4---zasifojapabo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1c469a2cc448e1b045506177909b7bb2/3128765079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=words+that+start+with+m+and+end+with+lPDF 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_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 17564 bytes
SHA-256: 15f8cb26d977da13ffc3c86269ea7f14a93f22f6ef9a47ca155ed4bf1de32923
font_01_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 10592 bytes
SHA-256: eaee45d2adac153ddb40642a6f280e8596b5162b22a73d536ea95df3839ee163

Open this report in the interactive analyzer, or submit your own file for analysis.