Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1cb279a303ab81…

MALICIOUS

PDF

100.9 KB Created: 2021-06-29 20:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 788b183a78e436f1c964fdab9339689b SHA-1: 37688788599febd299c2a3db27408eb4eabf9aea SHA-256: 6c1cb279a303ab81e5d86207aa111da5f0b42fcae584f9dc7477b4c6fa6242fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://rajskiewakacje.pl/userfiles/file/53018354956.pdf In PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zepivub.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/75752924728.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd98e97cdb0---fopejotolixovatowowira.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a00abd25---70140720060.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/4027691393.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/legipibaxur.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa73c1a53e8---31899567635.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/72559441301.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/66500709751.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160afecceb4d7c---23513426035.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/31380398224.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/opm7n3us9bg3iimr1158vsjpsn/loluvemumubumozetif.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/99rscle02bd2005jsrh4viisu3/80341945564.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9erfup4es0u32nj8v1g9n0e0dk/xefumewojunebu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/s7jh2jr8ofuupjf77djsnuh7rf/16204560050.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40fd19114---kamebamopujajisasez.pdfIn PDF document text
    • https://cape-electronics.com/media/file/97506707748.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/12192a5b57f9b1300564bd62653c43b3/mifajanafo.pdfIn PDF document text
    • http://gabortech.com/admin/file/33984257511.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/cda3126c9ab7bb6dafedef00b6e27fdd/gazidilasafurazedipux.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160887a814f5a5---rilagoxemipitem.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3e09aced8463b69b74a87418c204de09/nudimeniliredokaw.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0f2ffd485000a338a94e3a6855b20b8d/pajorebozizifanekopakoset.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=synonyms+for+answering+phonesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 10936 bytes
SHA-256: 0f9dda7e3dd0d288af2e61bb49aa0e60bb2c265ce5690f4f2605fcbddd7340c7
font_02_sfnt_off00012a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 16816 bytes
SHA-256: b299a85d2e51ac658c3157d1a2a6040aec5d7f8bff6e36da2f54d1f6a1045e4a
font_03_sfnt_off0001424a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424A 3064 bytes
SHA-256: 9100de51a2971e9ca7ffb79b7c240badc68434c64460f8514444cf78b0676521
font_04_sfnt_off00014eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EED 20840 bytes
SHA-256: c87b1a8806108e0ad16312c129fdf44735d65150ae1f36c97c085f159b25844a

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