Malicious PDF — malware analysis report

Static analysis result for SHA-256 5136bb78300f9d20…

MALICIOUS

PDF

107.2 KB Created: 2021-07-17 18:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a52ab2ffdf73243024faff06888ffd8a SHA-1: 3f42220570986060a24eb7a2aea8fd6d765dab90 SHA-256: 5136bb78300f9d20432fe738245a9e12afd05c67283b19e538cfd1a6e3635203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://seitonsolutions.com/ci/files/37590992657.pdf In PDF document text
    • https://copab.tn/216mag.svn/uploads/files/zenugoripefekavusujetemu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e765b9078f---19479878519.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f0d88de17---sivixekakorokowunetejaw.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1bf79fa30---46202314240.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xipurinijeretul.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/durimatajarutodovafebi.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/29204892660d3ae36cbecb.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/34923488de9baa0e843faa7bdb501bcf/12370215782.pdfIn PDF document text
    • http://adveotec.com/img/file/92044305739.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dd958206f27cb859c616b3e8c711e4e3/mawiwixaneduj.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e77737151da---diwotugenufuxosapovuvib.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/xapapos.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607879238446a---zilevajezemomoxikefig.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/77315572222.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/61045052643.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/maduwegejinowupisovanigi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936a6056937---55447568032.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/resinafoz.pdfIn PDF document text
    • http://funperm.ru/content/file/74934591032.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fe43de75158f8c37f30700c9b3e24f0f/tovukinulafibutozasufilu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160822ea24372a---3077707711.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607374fb75983---77870855944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=electroanalytical+chemistry+lecture+notesPDF 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_off00014007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14007 17376 bytes
SHA-256: 97d1841b050357f08873e03dee43e94c89d9848cb674aa861487f97b5b24ac76
font_01_sfnt_off00016d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D69 10692 bytes
SHA-256: d6a51fa58cf4483a4a4ce0f623160725323ecfa021f46ffc9f579def84e40389
font_02_sfnt_off000185c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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