Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ceca5c3d212a12…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 10:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 631f6757cfc5d3d0e470e4b201b3c683 SHA-1: 82a1b576529c431fb4d57fb0f6149999aa3ffa8e SHA-256: 52ceca5c3d212a121060f5477db1aaee8c11df37871ef852a1ecef325bb26c91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting it functions as a link farm. The presence of embedded JavaScript, though obfuscated, further supports the malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=evolve+student+book+2+pdf PDF link annotation
    • https://inverpalmas.com/aym_image/files/44583387863.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/62773475014.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/30121589855.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c058731a46---wefarobiwuvuzodatix.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/bemavexasilavawodozudal.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/xitovuxowipav.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/60050819774.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/70657dff1dfd2bc72040c39ddc9e45c0/96382958385.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/jeworuzufomilimuz.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ad7e6eede---43633343806.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210920081657.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613656b0af5a9---10018009697.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/dunisu.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/37131574682.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/65166402805.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sei4greiarei5mqnv7ojjbphc0/vazumerada.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/55728651116.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/nojizixuluzofonaxad.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/21853397426.pdfIn PDF document text
    • http://tzsunup.com/upload/gotij.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/xofufogefeja.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/96186330542.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/forebos.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/89744689218.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/78260097972.pdfIn PDF document text
    • 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_off0000b3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 20736 bytes
SHA-256: 63d6221c84c81e5bc7a4a8dbfbcff2a9add870002db62414bc593eea11353a0d
font_01_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 10636 bytes
SHA-256: 09ef3e7e79943f0f189c25fae2f04d08b6afa3d6ca5099b61b9b6cf3b2cb9439

Open this report in the interactive analyzer, or submit your own file for analysis.