Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28ae4f26b1e3030…

MALICIOUS

PDF

77.9 KB Created: 2021-06-26 12:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 48d9e64feed0a46ecbf1bcd2010f4d6f SHA-1: 54889a62bcd68464c69503a70e113ea0cbeda13f SHA-256: a28ae4f26b1e30302accb61087d9141307149f7b4c12d8cebc39ce3538ef720e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of multiple external URIs and the compromised CMS upload link heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=1+cubic+foot+to+yard PDF link annotation
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/668d44fce1798b8b16ed2e8cbe02e784/nakowikuwuwakasijazu.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/tududamedofajetuwowagega.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768a818c70e---jumirigom.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/28958445957.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc35dcbd0---98627891759.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dc312ikop75sndgn0tf6od994l/natitipolegexemi.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061822123073499.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/49a35d8afb1f9ba5d5460f1bbc4262f1/pirewogelemaxisiruma.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/570e0d4867d31543b3cb25daef495b11/lowirujifatizabitusisaj.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/wogapusotogenixajujuxotu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f501cd786a8a2bd3db9aa1ab7ce520a2/gipelimirimofepil.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c96758229e896c496f8fa692d6347a1d/rezeralisegejaf.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4d0fde6b358b75a643c4a6c526b1174e/rivazoke.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/19906620340.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1745d9b9352b721529648dcf694964c7/borenevefipe.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/wozuje.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r4j6vg6efgsc4agrah5mokqonn/64931741642.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/24249198090.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/sexaluwugupivoduwix.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/47568783ef570387eb53203cd005db21/denuneg.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/023a1c1a99ddd7af621757bc694e5038/pinotelizagikimotas.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/702f5e4624ea288e542b8c8d832e78c5/nitatene.pdfIn PDF document text
    • https://nadamasristorante.it/file/fakalitazitabazejabajakol.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/simujazasuxoxu.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_off0000ce69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE69 17092 bytes
SHA-256: 5157932c34b0ef436b07fe2332010f191018e4a25d0a9af87f63336227b29149
font_01_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 10328 bytes
SHA-256: 70587edc3bd33176bb28d5471d045ee7ecb1c8858311b74261b07c808a27afbc
font_02_sfnt_off00011253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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