Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdcdf7ee2c3814d…

MALICIOUS

PDF

91.4 KB Created: 2021-08-25 17:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6c17a67506f9a90f8ea52da071ce4aa SHA-1: 5eb350957cf04dfb8525ede501021a6f23c74723 SHA-256: 5bdcdf7ee2c3814d5ba033e79562bc609b32e23cba760a58f8b07a99221c5009
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document's structure as a link farm suggests it's designed to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f6ee75186---gifikadux.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/trkcu1acvv0h6i1g15c0it2n7b/tofovezefabuvodivaxisi.pdf
    • http://cudicio.it/images/file/tenapolim.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/99479442888.pdf
    • https://alibabaoman.com/basefile/alibabaomancom/files/tujasobijodaposer.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/l8bdd1vajtpe1p9a82os3shic7/53745969409.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/18mqds254t0et4vtsndllkat82/12193841802.pdf
    • https://doganagolosa.it/file/76143927645.pdf
    • http://adance0112.com/upfile/editor/file/juseritewijofemiv.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f6a9f6051e94fdb86eba4cd49e83c713/jebopatupikewamaxasewebu.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc24f3bf98d---32356385368.pdf
    • http://stasta.com/userfiles/file/suxipajugaromutetajemeb.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb5f04aaa1---jedonajuxifozaroneb.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/u7835hbals3drgoe6078qc3qra/togakusugewu.pdf
    • https://airflow-skateboards.com/upload/file/xinifumolulibunoririle.pdf
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/bemedi.pdf
    • http://www.aqsclimited.com/EditorImages/file/53043471368.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/2a1e13f17d7af7c25fc98c142ef01772/zowimunusod.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/59131428903.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c836de021---bawonaletofadinero.pdf
    • http://aftckwt.com/uploads/file/vutuxoguvezekasodopujale.pdf
    • http://hvpeds.com/upload/contents/file/56757339946.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/69098467657.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/079a781dc4dde0846efe0fda5c8d148e/kafevige.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087eb628d76d---93121255946.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4f4996a387a0c848c1a4bf8f1c0a7cee/rebinemojunuwexo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=songs+about+god%27s+love+and+faithfulness
    • 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_off0000fd9c.bin
5661e307631ad0d1c82488b8d3be8f30afb33229fa17b08c3383dd9e80ebef52
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 17776 bytes
font_01_sfnt_off00012be9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 16792 bytes
font_02_sfnt_off00014400.bin
ef991acc52fa60907ccc24502b0fc8f1a0e45145635e0abc6e565c15636482a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14400 10948 bytes