Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1069274e2096cc2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 15:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e559fb906f39f38e34b201f9556a166 SHA-1: 34807ef6440039a55a66424078733357f8df23bf SHA-256: b1069274e2096cc2d30e53fc5368b1d82be4c576e55f7a8fd5bd816be05d1a3d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://grandp.ru/userfiles/file/muwukixogig.pdf In PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27042848501.pdfIn PDF document text
    • http://feg.vn/uploads/files/8904448760.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/65854952359.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/wusadutakozidu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/727da0c4bd1b0604583de3ce5a8f43ff/rakutesudo.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/lavesuj.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/89052096233.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210814011528280.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/392e7421f73a13f2d3a36064b290434e/wikinipezopigedojifaxazi.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/xidofutifumilawuvifar.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bfa8b405---letugelabalepafunagaxi.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wudujigoxewaminijan.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b90edadf02a0d83d0bf5a9abdf6e6732/61371911760.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e66866a55f3---geziregovajixowerujurolel.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/761b853a99ae21e5c9839cbc28a769a3/97707710625.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070657a39228---fewutugosewubop.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/59830581278.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/82258656496.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/84452555954.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/soxunimisatogajujevuku.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8ee0e292cdd9421d93c2e3278837bd81/43431334206.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/86738632176.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e8f8d96a8f07935f86c3e541e272256c/89602369850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=measuring+units+worksheetPDF 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_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 10612 bytes
SHA-256: bcfe63b4ad284d17c03e50464de096884ca28b0bc02300eee0e3ef776948d22c
font_02_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 17992 bytes
SHA-256: 1f4b5d9a2c7209a357f45a14287182e26f6ac86bfe2d188c8a48c2e85b3bbd06