Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ffcc5024e2f533…

MALICIOUS

PDF

88.5 KB Created: 2021-07-08 07:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02216d4f4bf15094d720891cc6fe98d5 SHA-1: ed41dfc392591cb79fffac9ccf5cc8afad126316 SHA-256: 73ffcc5024e2f5333b1632539199468f807839c373573ac810f9824fe6e841fb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mimpishio1.com/contents//files/61207410988.pdf In PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/76875104646.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/518b8b30902d27847e83cc3b7d513d3b/zofevotemigunuxo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd08d648ac---98537794371.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/vasikutovepe.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/39875824807.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/mafujidobekudixobej.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/kisapuxibozafenufiriwoku.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ef8e3f227d6cc2485e912bdf17e71599/92041151440.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727fc802e80---korixirekulu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084717ece975---wogexal.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/nejalivakixumimumadima.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/25984475490.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/92449622456.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/53902082292.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/milixusi.pdfIn PDF document text
    • http://sam-global.info/files/file/xegiduwinofenavozow.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/43957292520.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/xonisoxabejokofuxuw.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/liboruruvalen.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/1g5t1hsajs7qmt0k126i1hm2dt/texawulunukokogu.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/50201951166.pdfIn PDF document text
    • http://c-amc.com/upload/files/45311612397.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/25063239216.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/mokunuranuzopavavonaxusut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=chemical+earthing+procedure+diagram+pdfPDF 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_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 11028 bytes
SHA-256: 01cb781452fea613410b2d1e258023d2a20e9950abbe55343b5b4e5be734d8a4
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 17620 bytes
SHA-256: 1278811dd33c1fe0fe41a2f94cc9dfb7ae1705693909c25c419f59f8067ddc19