Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f8707cb29e8a52…

MALICIOUS

PDF

80.1 KB Created: 2021-08-25 04:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a141d74e2cb0906539956b826197994 SHA-1: 055f8b263e4f6c56e13a41a5b13d2334a8c40519 SHA-256: 49f8707cb29e8a52a3535aba289f7ac4f4cdebc254aea61c45528bc1c6337762
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term_redirector=True' further supports the redirection aspect of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aj-logistics.com/stock/userfiles/file/vajuvisuva.pdf In PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vovodupatadivexajabew.pdfIn PDF document text
    • http://anm-av.de/uploads/files/44935895450.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/5727417632.pdfIn PDF document text
    • http://konberdbio.com/upload/files/50093227397.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/uuvf3l6ehc0hd09ro2qvud7p5l/mugopopomujurafoxe.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202108170101155430.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/99374411487.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/lowot.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16080931e7a733---99720773605.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/91297199558.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210719/1604146553.pdfIn PDF document text
    • https://aedwea.com/upload/foto/3971837111.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/lokemisiragupepeb.pdfIn PDF document text
    • https://bloomeng.com/uploads/86185708293.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/64024908852.pdfIn PDF document text
    • https://unosms.us/userfiles/file/divemowebepazaxi.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/96654058666.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6359e89dd3---99240439875.pdfIn PDF document text
    • https://samudra99.com/contents//files/mufub.pdfIn PDF document text
    • https://12shio2.com/contents//files/sobigekotepevafidulax.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4451fe80---volezubovujowuxuba.pdfIn PDF document text
    • http://imi.vc/upload/files/renubonir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=a+silent+force+reading+answersPDF 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_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 16280 bytes
SHA-256: 7c7d153b58f72358c99c7529a859c3d79267ac12c23788be4a430e6b336063a7
font_01_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 10716 bytes
SHA-256: d9b80c5d2b4564ec2b2bcca4c30ecb24f9d433be5c3c36f015e8a79ecd5a5f67