Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7c84d45298e2c8…

MALICIOUS

PDF

84.4 KB Created: 2021-06-27 18:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf962c2054e02f833233bff61661ffd5 SHA-1: d8713d16585c99ed357811f6f3d163793e38579e SHA-256: 9c7c84d45298e2c811c2cbfe05acca7ebc092501a65202c9aa28ff38539a44fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The PDF's structure and embedded links suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/t35fjvnjlrvd7ddmb01t7l8f97/32952880932.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00da99f51---pefaxis.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/overclohrl1ma7kqfhc2egjk0j/befogemotobiroxex.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3a401d98e9c7e32a1fdf9e3777db4f2/xugibujekatuja.pdf
    • http://ferrogep99.hu/static/media/file/zagadubevagadofezunatos.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a17431e95a89f2f2ad0be3d780b2aaf6/potepilaludu.pdf
    • https://photojet.bg/userfiles/file/86065123145.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c214a44cd86---disimirolajirafojumuz.pdf
    • http://18554080.com/userfiles/file/kiwul.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081d0c118531---31048599173.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083cb07930c4---62257917208.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073eeb04d376---21496246469.pdf
    • https://nhorizontours.com/userfiles/files/warudidesisox.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/12219535862.pdf
    • http://hondatayho.top/img-ngocbao/files/ruvogimurem.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf4b3ab2cb---jubabegelizuvazaweser.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/39d99c49284d1437f11c66cfabae0070/vitifibagogomatalifi.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bb4456e9a4d7b7f5412e1bc481e4dda6/17802195286.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe23ec7497---lizamaranenib.pdf
    • http://charivne.info/images/file/87033555462.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/v2v840ndheklb3d8ppmf9brds3/3250659760.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8ffhh3i2u95r1152r00mggv5e1/56401922968.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/96e952bc06c5ea3abeab5826c15578a0/wubusuzaka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=file+with+name
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000e977.bin
8c4c312b4b868f4af8162b6b785b6a19713b8f5be4928abf4ed1ed786265e59c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 10048 bytes
font_01_sfnt_off0000ff8c.bin
376cc7116c10c3c90f9d21a2c9eb58adfcaca05db29c2ce498eb346041fb6c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 17324 bytes
font_02_sfnt_off00012cb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB2 16792 bytes

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