Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53309464cf92d7a…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 14:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84c0d92bdff2bfb3957c1f05bca45e3a SHA-1: 6c54b9bb081d26dc22a1e4711bce0f576d0a28f7 SHA-256: a53309464cf92d7a2cfd1439f721e54792588d364c429ec26709d03e00e924e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to other sites. Several URLs point to compromised CMS uploads, suggesting a distribution mechanism for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f25b0043e0dcdb91b34c2a1471fcfff1/fesozurege.pdf
    • https://karpataljaturizmus.hu/upload/16753727709.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16132ab6a538b3---61101818287.pdf
    • http://wooshin.kr/uploaded/file/238754638613223e475af9.pdf
    • http://kazuma.ru/ckfinder/userfiles/files/99831433213.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f49bc132e5fb616f57ea7e12b06e62d0/zirixomapegu.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b191c50b58---72876957110.pdf
    • http://starfishdowney.com/uploads/files/16394856125.pdf
    • http://taxplus.in/images/contentimages/files/dilulerotipimixazarav.pdf
    • http://asja.ua/userfiles/file/burufawalazizikekuviviw.pdf
    • http://cokhiminhhien.com/media/ftp/file/xigasuwes.pdf
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/9946875396.pdf
    • https://protrialse.eu/files/files/levozobavuzisopujurez.pdf
    • http://sharon-barron.com/userfiles/files/kozilipugiwux.pdf
    • https://kentacademymiango.com/userfiles/file/tobowowugadigobiluku.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/gojozovonotuxevujufirot.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148fdd1243d4---lefarilivasetofuga.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/nodirulowotifer.pdf
    • http://irths.com/upload_files/files/xelokojepukepokiduniv.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/26241121430.pdf
    • https://petikdaun.com/contents/files/morijisupunodafupozemamad.pdf
    • https://vozilasavozacem.rs/files/zofitomajerujuvubutafer.pdf
    • http://jamalcar.com/userfiles/file/fonemesamezirotajomo.pdf
    • http://www.mustwalge.ee/data/content/files/27545201859.pdf
    • https://nadrozmerne-sklo.cz/uploads/59041990250.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=8+ounces+of+water+in+litres
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e6.bin
882578bc41a59904602075c54b6ee83f90081da1c30e034305d0750dff6689e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E6 10628 bytes
font_01_sfnt_off0000ca71.bin
21e95aeae58e47e7857ebab557b75a6f8706467fe6438db8d98d875395402442
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 14716 bytes
font_02_sfnt_off0000ef4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 16792 bytes