Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2547f82d9b6817…

MALICIOUS

PDF

132.5 KB Created: 2021-07-10 10:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c230393beb86a8657cdf8e61a8d62e0 SHA-1: c07de1fea0ccc1dcf9ac8b45a4bdad9b0fd66ea6 SHA-256: ae2547f82d9b68179a4dc1331340a6b882abde60a85e8407d860333069a10e96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is unreadable, but the overall structure and URL patterns suggest an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/sjiv56lac48autll8jpckhshfm/mudapovevutu.pdf
    • https://fairtradeportal.pl/userfiles/file/10217225337.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c4de401d---fixisavemi.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/dowisukapiludejikep.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/67060176673.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106152248262448.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/xipiboboxena.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/86263465709.pdf
    • http://abaj.cz/UserFiles/File/74132099147.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f45ad81c305034e9c3e9a677b549c737/32685600075.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc1f77715---96682580602.pdf
    • http://pensjonatagat.pl/userfiles/file/50749546303.pdf
    • http://liburnia.pl/userfiles/file/22311156330.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a34806d9ed1---lifufowaregibajisolut.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6ccf244a---nafazo.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/muximakinobigavonufogi.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bcd788b67---posutifefaxarojile.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0e94a6afdc91ded697f00fca813cad59/6704674305.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9759f45a4ce55a7e06b14a6e49ded16b/71854620769.pdf
    • https://dineflon.com//files/xirumomazo.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/fonotonavelazeniwenalez.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e76bbb0f60c---rures.pdf
    • https://unitjaya.com/contents//files/xogomor.pdf
    • http://tofuyatogo.com/uploads/files/53935942632.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ts+eliot+poems+the+wasteland
    • 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_off0001a525.bin
b06d154f376d5d508b6b3b1574b10e495b97c532d540c1872ad44c27229fbc4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A525 18616 bytes
font_01_sfnt_off0001d464.bin
df39391bd1f2dbf988697a98b6979d06c5b760b517bea5f57003eac9b5fea515
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D464 10608 bytes
font_02_sfnt_off0001ec82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC82 16792 bytes