Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b53c2ec585f52f…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 17:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8aca1052ac19c081d8b5d7551c22c83 SHA-1: 9f7b3350de66c677bfe3e2587575360772a64539 SHA-256: 61b53c2ec585f52ffa2ae3aa5e0364b8370015e8d023a51d8e269051885bd6b8
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 payload. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://yilip.net/userData/board/file/momejidonatixisaxifoxed.pdf In PDF document text
    • http://softwarefactory.nl/images/file/60150289008.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/71211010105.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/19421694344.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075134cb9236---minuvodesofixokik.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/genafonu.pdfIn PDF document text
    • https://digireg.lu/upload/revadevokefulezo.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/t2n501jm8mr3un7bb2l5oivrgj/90619626521.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876211924c2---jobigukalajexakenudasa.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/80480516640.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210623201522.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/gofipuxodonuguxag.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/tupolodefol.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160eff86944baf---deliledusujunatusi.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ad14eb272a5b419e0e48bc8091aa9a13/89488216055.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/95924885533.pdfIn PDF document text
    • https://goldenapp.net/file/jiguzefebiwesit.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/tidisawomipomajurebuta.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16123764f4a80c---31555141064.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/0sslmn4d7m7spl036pv2pv7cct/jinibegimivanuxifid.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/931eb8f04e6d4a4c9db326ce9febc058/17776283221.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/441f82b2922fcfd69d86f99670c77d77/nelagek.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/surokolinegadorisawuvivis.pdfIn PDF document text
    • http://jonellchem.com/upload/files/fenefuzig.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/21148002636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=crossfit+wod+book+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_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 19168 bytes
SHA-256: 8002a34e15fe48705d0d739471b17f84297195049a4727c7c01e696e6736e439
font_01_sfnt_off0001294c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294C 10396 bytes
SHA-256: 30bf03c23beb29920213aa1c230851e677bb1801b7e597b120c77fbc04489664
font_02_sfnt_off000140cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1