Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3594dd0486abe01…

MALICIOUS

PDF

89.2 KB Created: 2021-06-25 20:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ef0d6bb47601053750fd4f22b93c368 SHA-1: f1a1725ffc6aa52b5ec09111cf1bb876e3a82e35 SHA-256: c3594dd0486abe0168a86607ed0ae3a16ac9d67a12722cab8fed332d97c3cc7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute or phish. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=bud+not+buddy+lesson+plans
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced308d898---81550764672.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a284409b5f7---xotokudujisub.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec3aa8529---27232472932.pdf
    • http://plncse.hu/php_data/file/53175344868.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/325836e28637b8ca749cb636fad41a52/69927859335.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d62f23eb---17234445719.pdf
    • http://allamericannursing.com/userfiles/file/refakozimesok.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9e8bebf36---2182797149.pdf
    • http://tcihk.com/userfiles/poxoseni.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b2250636a---76024531702.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607203ae5e75a---nezewurotare.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/23516b245d6b99e50265127e9710f2c9/44717395585.pdf
    • https://mfdesign.hu/files/file/19760591703.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66a6964687---mujinasuf.pdf
    • http://greenbiotech.vn/uploads/userfiles/file/xasulubazomegaxutile.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ce921fa96893b44fa90b375c5829019a/vuwobove.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd184672432---55377029485.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9141e65d7babd4b65129f9c044bd00fc/10246404595.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e86d8cd9f7032e9419f6846721fafccc/5532169203.pdf
    • https://avela.md/userfiles/file/vuvakivapuxejis.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/nadusagovazena.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/voxotaxakoxiwiwam.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/m9pl59fbnrgrv88i8ujvoe5b4v/rotaxaruzaxotajobawiw.pdf
    • 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_off0000f9e8.bin
e1d56632a2d666744b9225068ace43b67ba7aaf51fe40081f9fbf67f81fc2ad6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 17408 bytes
font_01_sfnt_off0001277e.bin
56d11a12a3ad0cae0da9b5012b77f70e31727b4e926a0edabfd9b573dba9a628
pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 10600 bytes
font_02_sfnt_off00013fbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBD 16792 bytes