Malicious PDF — malware analysis report

Static analysis result for SHA-256 044a8d3c65ec2930…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 08:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f31a8e6f34c6fc70f6cc9b5288f8345a SHA-1: 4b47c7de1e13746c6e96d3b8b4ac62da997e5dc9 SHA-256: 044a8d3c65ec2930ac1f457bca979fa794ab969aa097a6da5093191793047133
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the presence of PDF link farms and the overall detection suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a7aa7c483f675d5e862c0c6ae22361bf/49717948920.pdf In PDF document text
    • https://knurussian.kr/DATA/upload/files/202109070547537405.pdfIn PDF document text
    • http://otczenacts.com/media/files/5780195443.pdfIn PDF document text
    • https://ms1oke.com/contents/files/gavizivifurekatoset.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/32949520124.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/8052569976.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/78152060739.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/62886740034.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8596c9ace---5318620874.pdfIn PDF document text
    • https://isosklo.cz/uploads/17051878766.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/medanaterexivazomugoziso.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/31491578087.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/37937968792.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/darabike.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/25844159374.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0ed76d10f1f1c82b2760b35596814432/sixitisumapifox.pdfIn PDF document text
    • http://spakimthi.com/upload/files/wusenodopivupasogo.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/texadonelevamuxa.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01366a6d1---wukupaponazasa.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/dekomulagugezes.pdfIn PDF document text
    • http://melabo.com/upload/files/56728509010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=translate+webpage+chrome+extensionPDF 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_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 17916 bytes
SHA-256: 55d70718ae81d0ae132c2171f3db876b711223424abd5cfbfc73f13930396101
font_01_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 11112 bytes
SHA-256: 6d913d74f745f5f4affec8427cd8cd2019b4581e8eec5871a602b99dfe92dd0f