Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c37446566290a2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-27 10:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b98dd97638dbd3ddbeb0fa2f5f8176c SHA-1: adde4429eca5c1602b3f35b7741690843f56b187 SHA-256: 28c37446566290a2731a44e406fac0f53840e801d6927c8d814144ed90bd1832
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be hosting uploaded files, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5522

Heuristics 5

  • 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
  • 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://csc0451.com/userfiles/file/20210916032553_03175v.pdf In PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/loxek.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/tosenadisuvedadonajero.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/41554177241.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092002272090.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/dapogekoxafu.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/39675134381.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3b9d9bee652c207895676dc4373953c9/kemajizizunelenozinimema.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/10943119331.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/vojab.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-26-03-43-59-43.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/kidebesed.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/nubuxuzexalafazavoje.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140103c7c3f7---porokuwoxefapusafoz.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/20340574735.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/fuwufepoxeten.pdfIn PDF document text
    • http://manu-transport.com/documents/file/27149357078.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2e669c5c0---tigonevorolerizogidefeva.pdfIn PDF document text
    • http://naylorrealty.com/userfiles/file/27758227247.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/vikosibusipebunamaxovog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=com+google+android+feedback+removePDF link annotation
    • 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_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 21312 bytes
SHA-256: c193369fc5e11231488c57982a667151cfddffabc7b247f6bd09891edddca737
font_01_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 10884 bytes
SHA-256: 3cf1d272405cde3c9f23bfac494e2a9f4a2aadabd14882926b08d273d568886d
font_02_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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