Malicious PDF — malware analysis report

Static analysis result for SHA-256 53481e08533471f2…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 18:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5d5efc8d5c7c6e5495cdf52e6762b204 SHA-1: 491b13758a1b253b765c55b5266cb4aac0b57a87 SHA-256: 53481e08533471f25380549ba048ec6e7bb8fd6dbde7e29c5d80f40052b78a87
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The presence of a high-confidence ML detection and ClamAV signature further supports its malicious nature. No scripts were extracted, but the structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fipjp.com/userfiles/file/riwanaf.pdf In PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa88bc1f6---55772903087.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af855342ff---53200296286.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/eup58duc2re9vq00td6u4t7c75/rimuruwi.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/856476d5862f16bb84548f4b89fda06f/potedumab.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/ranarikixajewowulama.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/84848232268.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/limijewakigiregag.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/tefapexonunowavugeman.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e8d2148b---10348327300.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/88175415597.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/9ib833tubd0k7gcspu7lj56ju2/68608332629.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210628_011551.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///15231414316.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/59e0a1522e6130db05bf2995d688f9cd/24795581099.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3057d43f7---kizeluduzoxemagopuwop.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e69df2701f---392332421.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8f5b9b7a77bc1e6a2cc852f333ed9db1/29783218065.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/68997727285.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098592816743---86049381095.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ee5cbe1b---dukova.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a7e7843ced8162e42a2e462ac20f412a/13981406288.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b7723a8bb840868c04f0d7e682a19d5c/zulijimokelebiberowa.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607821016fc44---dupugik.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624354674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apk+lucky+patcher+free+downloadPDF 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_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 10828 bytes
SHA-256: f70ca0953ce9823c29d94731b29700185ae64640502c4302ea6359311f28ca3c
font_01_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 17336 bytes
SHA-256: e3e9227801649520e9df6b1e79b32e7ea46362dd18592c02f5c2562c857868f6
font_02_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1