Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd854b6926064e5b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 11:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5adabfa0f181cbd2561127f120dfff2d SHA-1: 24b511e71d802b8dd46a3257a86ad6c398d4f277 SHA-256: cd854b6926064e5b28752e3507ca814c00471a53ac8b67abc63c2ff7c197441f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/rowirunovugozotoba.pdf In PDF document text
    • http://foxhill101.com/userimages/71034098058.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5839689c9c9c061dbc5bc84c1eaa9745/29545463166.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/56051572450.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/komukokilijigadaraminevuv.pdfIn PDF document text
    • http://poorclarescork.ie/images/26801127763.pdfIn PDF document text
    • https://ksa-machinery.com/images/file/xadiw.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/24026895464.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/90086134380.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430a826a30---45961054575.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3t5h3rebrdui5cauq398n3sv1i/17354607890.pdfIn PDF document text
    • http://www.moyekolodin.com/files/besixegegijape.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cf583f83---fetifipagagogupejimeg.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84a1ed738---97830162860.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/56473031035.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/62770318632.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c5ca0b66e---74095003045.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/2ecffb9f660a8bf8dba5aa46bf39c2fc/30357130408.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02d79a11c---zabijutezusilipuvupu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b17488e5f---rulurebesovox.pdfIn PDF document text
    • http://vswet.ru/f/7256162895.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/jeqcr83p1a9uqias9shu3ol143/dojonevi.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/79290695247.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/miragerun.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f3e766f4c0a2bfead11903e01582fcc5/63470285894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=openshift+documentation+3.11+pdfPDF 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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 11156 bytes
SHA-256: 63767b62327d2ac774750d5387469f8192e6a92fb4c5e63cfdaa28a3d22c7460
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 18384 bytes
SHA-256: 8e9a02243241a52272acf87c5601158c44d5bb44d8741f4b217c81b7a8e4f8ba