Malicious PDF — malware analysis report

Static analysis result for SHA-256 7438031c1aea86e3…

MALICIOUS

PDF

75.2 KB Created: 2021-09-22 18:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a5bf2737be4778c66845b1780c8b5558 SHA-1: e4a1aba3f63fb8ca67e9b3367519bdae25fb63dd SHA-256: 7438031c1aea86e3d4873d39c5d422c9f00d1614250f00fd9e9dd27c7fb2f8d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these URLs and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=shooting+photo+apk PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea06e8e24---gujisegudexekelisadiju.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/26712516564.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/xovigutab.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/93482262262.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/95245660032.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/zupadebazu.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/silol.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/zijugazakomivudebumelila.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/13182000380.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d08978642---87923349656.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/nevupibetefuda.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/kozabuno.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///33299323110.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd8e4d6bd---5270966960.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/koniraxamaw.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/5345861725.pdfIn PDF document text
    • http://hangquangauto.com/files/93538528070.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/wisuramurawewezawexuj.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161457d3e564c1---8872274611.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/mewatabili.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/62221178690.pdfIn PDF document text
    • 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_off0000c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 10252 bytes
SHA-256: 85509d0821ba246e35c3936e9754a9c039249ccc56d04582bfd68a94e0a1f85c
font_01_sfnt_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 18616 bytes
SHA-256: 8f494d28ff3f456c73a29dc842c0723118b45f5704d221a69e480b92154f5135