Malicious PDF — malware analysis report

Static analysis result for SHA-256 5562751170ed31ae…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 21:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 443aee3e82429a13f7ec46d9b4528e60 SHA-1: 10d0ef0b05f0df6bb4256ec1ad92bc4cc146c3bf SHA-256: 5562751170ed31ae1b680c7390c54be9e26cf4496aaaec0a8910d0e4157480a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to PDF files on various domains, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

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 http://kechengchem.com/upload/files/tutobujawof.pdf In PDF document text
    • http://hanabi-la.com/uploads/files/tumiwudot.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/lovuti.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/92007149788.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109040611106421.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/siviki.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314256412b7---kogujerawomevite.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161420fdd2643b---69488661641.pdfIn PDF document text
    • https://teamcode.net/upload/files/47662031001.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3fcd4aa71---zamutozeneju.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/97850350345.pdfIn PDF document text
    • http://mopron.ru/upload/files/33630428447.pdfIn PDF document text
    • https://tuinvandecruys.be/file/28651118765.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/vigesamoregirages.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/zesekawiv.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/45812729402.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/4131744743.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/sawulet.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sefevug.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/37282081272.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/8839804276.pdfIn PDF document text
    • https://theipbuzz.com/images/file/4912313811.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b21421a97f---zojag.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/62088413625.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wogomewuwadexugowulutut.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/81948936094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=kattu+vannu+vilichappol+mp3+songs+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_off0000bda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA5 16660 bytes
SHA-256: 83039a97d653e6c8c057ae61d1faa9af4171c854230c8926eb2cb2a1c9b780d7
font_01_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 11144 bytes
SHA-256: 944f3f9882cf4fe3ef4a50e3f7bba167a4fc20aac83123d4beff7d33b87d7c4f
font_02_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1