Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b5f2d3e11178ec…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 19:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c56093199cde21e8a8948e938e629b7c SHA-1: 4b173d5b13862ff2f3f3c26b1fc3d13bbe8f2b85 SHA-256: 49b5f2d3e11178ecdea4e9be0a7dafd25e7526ea5c0966931674ec3ededfba09
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier flagging suggest malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6243

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://coinproject.com/userfiles/image/file/88497438668.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16104510e907be---69391301488.pdf
    • http://dpsszczytno.pl/photo/file/fariradimoki.pdf
    • http://jpmoto.biz/upload_picture/zuxumufivi.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1866c52b235f7caa2fdb44630fe4cec0/jedorokijesugetirudigikiz.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/96504845991.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160947597eb517---nezabamifenevuw.pdf
    • https://sardavetri.it/userfiles/file/41303483371.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161150dad7db61---689172292.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/r5bdohfsf449at498mng69toms/87870432725.pdf
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/79072454362.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52978fa48---99145180647.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e55092d83---62179001021.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/75d7fa804445241fcd24a7c3f9a0c96b/niwovebepiponan.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/786e5f4b7a4f5a44e3e4802b5b514a8f/xezugogevigonij.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812662c19d0---pififefedamadujon.pdf
    • http://hochrainer-elsner.at/upload/files/31583265224.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcc7a1a61f---53722991270.pdf
    • http://bielwod.com/userfiles/file/64412863256.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/jadamerasegevukizinex.pdf
    • http://pensionpoint.cz/userfiles/files/82335968239.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e288046c2fe---25855416472.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/71c25f3f59f38c088861c20cc388f536/daduzipasugepajeliligof.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021f598dab---davogubekavodilinepi.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/39ctb1isj6tmup9mm0j10fmkho/zadinalefuz.pdf
    • http://fitviewer.info/files/file/webiruxata.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chronological+order+worksheets+middle+school
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19b.bin
1c80fd66f079469759aae2c4485af6f7da1f036b239f86a5f81a664e08015ca7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 16904 bytes
font_01_sfnt_off00010d18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 16792 bytes
font_02_sfnt_off0001252f.bin
02fcb44b2cccaa6ea0031ba68026e1b681c43b73f150111f7a20b88647183276
pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 11024 bytes