Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49e4251c34e3e93…

MALICIOUS

PDF

96.1 KB Created: 2021-07-17 23:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48484039ad34a278885bef1c62d9b788 SHA-1: c8652b7e0ba9debfa2b42eb2dfc778bfb911893a SHA-256: a49e4251c34e3e936fab32d0af3d9a221e1405137640d5b51c9d73c7f1ee904f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other potentially malicious content. The primary purpose appears to be directing users to external, possibly malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t4uvgeiq1n1g5rst93js5mqbl9/17577170981.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/40939563296.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/31562154346.pdf
    • http://asiancfea.org/userfiles/file/kunavejutoleva.pdf
    • http://app8itebarandgrill.com/admin/images/file/99449854341.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/simivubobikabiwil.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c9ea88bb---sijas.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/d13983b3b447681952a44072cf7d4b10/17334036359.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f169a002ac85af465f51c629e5a08327/48335355445.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/68cvkriatm68f2oed92bspgln3/pikemiruz.pdf
    • http://aapltd.net/userfiles/file/76968317616.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/64958136699.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca8ff0ebf---zikod.pdf
    • http://faradtvandor.hu/picture/userfiles/file/72593610339.pdf
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/65503930016.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/4so09b0120l0quuodopp62hgnm/26335790463.pdf
    • http://elturo.ru/img/upload/files/kodumawalozuxukona.pdf
    • http://anthonyvienna.com/sites/default/files/file/zigosi.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1011399f31---77358194326.pdf
    • https://boyanbolyarski.com/userfiles/file/75483208052.pdf
    • http://all-pass.com/folder/editor/file/tamulipamewuxokizuwip.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9969d502a---90112628470.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-11/20210611145431871575.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bricks+from+black+cotton+soil+project+report
    • 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_off0001133b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 16792 bytes
font_01_sfnt_off00012b52.bin
74eb125dc3fb8559b1befa3627e6989e52f74a244696223482843dab8c7ab3c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B52 11056 bytes
font_02_sfnt_off000144da.bin
837411db28b6a660cb87df30f510af70acabe86077141a0b796124a24b2ad4fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x144DA 17160 bytes