Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba73a82a84c3d9f1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 00:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fb1e56684f0044ed2511a14457c57b4 SHA-1: 70e3f134d586c07ae607c5adc8c857b4b231aa85 SHA-256: ba73a82a84c3d9f1407a5528d4953d81af00ad8746aaec30ceadaeea94737afb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to deliver phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4339

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://oniceh.ru/uplcv?utm_term=how+to+unlock+phone+screen PDF link annotation
    • http://servmed.net/userfiles/file/56939316655.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///xuragazejejumupixinopamuk.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/4888227670.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/dumipafiruwagugezo.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/41387541633.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/buxebe.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149ce55397---31433946303.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/sokixojukebosixagakaji.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kiithto2sgj1gh03g82f586iv8/ribunepefogekek.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/64833187295.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf9b1210f---bibigetagifomiwifig.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/92865944958.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/56157198872.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/2756758666.pdfIn PDF document text
    • http://cke.hk/userfiles/1296594754.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/legazozibupepuwaxok.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371111b3710---84655707404.pdfIn PDF document text
    • https://amgaa.org/temp/files/fakoxorukezigo.pdfIn PDF document text
    • http://olympusflights.com/files/files/39518535770.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/v2o4aljhc22mhkgk51antb9vkl/litelijumi.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/44985156240.pdfIn PDF document text
    • https://adci.vn/data/upload/file/desosegamute.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/vevipupijawag.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/26431071628.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/ruwexewomejatutevefutuv.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/rivesesikidejirumef.pdfIn 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_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 17848 bytes
SHA-256: a6b958992414404171f3115eab51d57b0690938b4db1f044cd7059f32bf3c31a
font_01_sfnt_off0001119c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 10488 bytes
SHA-256: 3c19b62285482171a8f452ae96cccf6b4e6fec708a6749e1584062628e7062dc
font_02_sfnt_off0001297e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1