Malicious PDF — malware analysis report

Static analysis result for SHA-256 542fa34af8dda0ee…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 14:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1f527a2d2c2c645cb2f6ab93fc82aed SHA-1: 43cd37f79042f691073f60151c1d9ec18b977b32 SHA-256: 542fa34af8dda0eea41aca4dd5d535ea30da377b33b34ce34fb3dbc4398a063a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect victims to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://atrax.hr/files/61921421225.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e6a6b572c938bab6e489225d89625ce1/82493799555.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0789f1366b---41566313513.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/23057400505.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/girakuzuwolimesatupabo.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/66814524971.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/98336798763.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/dirot.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/21110063917.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16218917328058.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/38e96a2d8252e6e149491965dfe4f39f/95665048244.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612856db059c1---kabuj.pdfIn PDF document text
    • https://eclearusa.com/images/file/popunoxeje.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/92248382529.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021052703472932.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/37507941074.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/90090705032.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/tapis.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202108232115451423.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a266763bc2---vemeriminogutomerixo.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/jerobikidiwopowidi.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/gamesosagimivupiroxelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=spt+18+inch+dishwasher+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 18292 bytes
SHA-256: 9df98081628740d82a6c8040dd4a55b210667622bd072f1ae3a5abda7986968a
font_01_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 11180 bytes
SHA-256: d39b7c40441f938198f24fc42aa2485e64d9c4035f133cf6461d3cb298c251bc
font_02_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1