Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7adad834522551…

MALICIOUS

PDF

144.9 KB Created: 2021-07-01 11:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5a13a0c21113831e33c57823923f9bc3 SHA-1: 70c7d54c37ba824096ca3544c752578668c8ee56 SHA-256: 9e7adad8345225519caa95209acfd550f1ee5e85e1aa1e01d564fc34c9a896c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest this PDF is part of a link farm, potentially leading to further malicious content or downloads. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic indicate a phishing or social engineering attempt to trick the user into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/es19dv3ravsb1e40a1ea20bv4q/xakokuxedati.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7685f1d7e4bdbdcc3a28b04bfd7dd281/89616860160.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/tusawezuxoxakiwepari.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/50075750421.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/rexufusepugusubozixu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ds03aoq6p7bkh06lnkunu36gnb/fufikatoruxi.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/4674977294.pdfIn PDF document text
    • https://clinicscrm.com/img/files/binatazebewafibogijusoj.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/divarutuzobevitan.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/junojug.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7pqr7od0fm3tr7ksfjn7vk3bt0/giwosikogojur.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/41022523.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/78834375386.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f2297df0d---dorural.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/u4rbg9e64kfjjbcmt5m8anin04/zoruvabiwinemutabovupurov.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/291661bfa55cd017598659bfdc64ff2d/87958189012.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jvd6oj98d2dgogbsila2gt5jrr/parifalixeselete.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/28902373221.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/oobh68ftp7pcstf5rosacndrii/wiwafedaragep.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c937d8f711a1cd1a650c15db9b4a7bb8/kemumosew.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/wawobitatarusawetisagogu.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/mitutiwekofikir.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/28892942158.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/df38eftvfnqig936aj3brkepnq/vizajukexekitex.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9c38a0d4fc1eec434c4d1d9fff98fbb1/56597231169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=top+chinese+automakersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000190b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8C5 23356 bytes
SHA-256: 0bd24ae3ccba96763dabe9904966195e3714db0728350a1e47376511bb2faeb5
font_02_sfnt_off0001eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB12 10748 bytes
SHA-256: b5f0703f90b7290aebbec02c505b45c79109c6593d2d3d1f19507ff73c511816
font_03_sfnt_off0002039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2039D 19408 bytes
SHA-256: 0832458ce15a07a9f6dbea245c434ad2cca14f2d9a1b7f07c849505c3a52c16b

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