Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f606167af4f7dd…

MALICIOUS

PDF

76.9 KB Created: 2021-06-26 04:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02255b391a301dc4148b2b943842fa3d SHA-1: b2de036bb8796c1dadbb6674fe3073ecfde63ad8 SHA-256: 16f606167af4f7dd87ec9c4c0f0f23d43479ee260c83da6bec3bfc18097911e3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest the document's primary purpose is to redirect users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7vouurkc65ronko2s8pj8kfaba/kawafudubilukuwugipitu.pdf
    • https://ferado.vn/userfiles/file/71773226297.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5vtl1kllmb90mp3ilb2sa7438t/vijatumatilukivo.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dd18d73c8---negarogizajezozewug.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9pi7m0ghmid3ggvf2lmhnf0u86/73928529399.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/1v0a8nqkfvudqhbg7mo1ev1irf/49118456525.pdf
    • http://talleresjpg.es/img/file/22365473457.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef27e15084---falitid.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3a879e0bb1b01adf668f0c7c174c96a0/kisowajeliremujosogopeb.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/daa73f2b2fbe7625e4f4f232053a73d3/jabejagajexazerinigomisax.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/f3c2c96061291e372403e86a321a00dd/litipego.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e29bbb93---fovinebinuwegeju.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b071e0887---98148906528.pdf
    • http://akademibt.com/resimler/files/97752516369.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ol19kjrff037e804a5gi5e55e2/fipumi.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8142b0663---tixekutidizaxeboves.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/kexenetozududuwolo.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a66529604---bisaluxolesozimezonirizo.pdf
    • https://tipresentoio.it/images/file/74470163937.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/mamibow.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a509f8dbb0---fisadiji.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3357b9390c---40697258529.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43c01268c1---88638796640.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a14c5d75d---jejinavaru.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fb131c6445d6621e4cc49ead99f1a798/jumifeguvib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cool+steam+profile+pictures
    • 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_off0000ca8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 16792 bytes
font_01_sfnt_off0000e2a4.bin
4cabd2896741362ec391d2a957c36ce03752b5cb28f95bbf6ff5d16fa5f00ac7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 10668 bytes
font_02_sfnt_off0000fb24.bin
a8890b4e0a219a7eb1f03c0e0df4d69d3baead3a19972ac63b2ae65c085effd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 16656 bytes