Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ec5e916a722bf7…

MALICIOUS

PDF

93.4 KB Created: 2021-06-30 04:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3678c0a5c21364f4e396b06c042cb7bf SHA-1: fc880e9176515f3333e83e0002464c3d79cf0b43 SHA-256: 21ec5e916a722bf7b09c317ac954596c6813f067af4b695610a87eb68ec0c90e
196 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including a specific ML classifier and ClamAV. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic strongly indicates the document's purpose is to trick users into paying fees for a non-existent prize or parcel. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a link farm designed to distribute the malicious PDF or redirect users to further scam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096913e77126---topufuronopenujezofewosav.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/b32nl2a95qbbfindf8js13gupm/luseparojakuwaxivubonot.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/pipawiguvojupuvazew.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3a6f3f71d9cf962d96c731405bbb33ff/52932876438.pdf
    • http://ampletrekking.com/userfiles/file/muwuzuwilamerididiw.pdf
    • https://emprenderem.cl/files/20163791780.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/nalatawepezimesux.pdf
    • http://casier-a-bouteilles.fr/file/wakekarelogebon.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf21b60f4---todarasogodefupi.pdf
    • https://charterfori.ir/basefile/charterforiir/files/5324148268.pdf
    • http://moristas.com/userfiles/files/munatulakojolawofi.pdf
    • https://penzionradvanice.cz/res/file/35898077413.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce8988615---tijususagilumaxul.pdf
    • http://lagunarent.lt/ckfinder/userfiles/files/rofujozeguluvijeluzi.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/77ab9c36e09fa2b7886501cb5547d69a/682185393.pdf
    • http://www.awakohchang.com/image/upload/File/268984375.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b2462ff0b69ca097660ddb9cd22c9747/gozoti.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/65548592940.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aee870d0f0---74992068399.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16087d83812663---bigizewezoweberojuziju.pdf
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/43070606578.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/uhstlgsi7rnisg048528n0qot7/warazibawotulujibegabowo.pdf
    • https://tonitomov.com/picture/file/takugarapobukumelevikevin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+critical+philosophy
    • 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_off00010a5b.bin
3fc9c5e0fd9d04773b1a975a5d41e10db1949b8db350e41259e01dacbc3ed214
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 17760 bytes
font_01_sfnt_off000138dc.bin
32198c1acbd0a05e0c12262303611d99abad506fc7d69465891128c3d4193760
pdf-font-stream PDF embedded font (sfnt) at offset 0x138DC 10344 bytes
font_02_sfnt_off00015063.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15063 16792 bytes