Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b94c7a2a9fab88b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-21 02:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4db5c09a962fb9525eb46640e683253c SHA-1: 15645e6cdcdfa74e4e258d7423037ac096f941c1 SHA-256: 0b94c7a2a9fab88b665a807e647a8bd61956d1de3167ccc7f25ee05c2831fb48
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 presence of numerous external URLs, many hosted on compromised or disposable domains, suggests a link farm designed to redirect users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern, implying the document contains a call-to-action to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=good+news+bible+with+deuterocanonical+books+free+download+apk PDF link annotation
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/81688512111.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/kopomekeluliji.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/98436110533.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f291ea07cba84ca311691f0d801975d7/gewaxisosa.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/nonevakinetorebo.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/94091843693.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jagolojinoxufaritikomune.pdfIn PDF document text
    • http://modern-pro.ru/files/file/49732992171.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/35995397942.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/5782938228.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/fuwopomeketogesasov.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161490d311053d---12690860505.pdfIn PDF document text
    • http://jljemc.com/upload/files/papopidoje.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/sokamexip.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/39747088149.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/75305432846.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/kedexewifuf.pdfIn PDF document text
    • http://computerdoki.hu/user/file/xelutatudaxopegu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/70386816501.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109071300127353.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/10664639467.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e637a329---15791173260.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7e7c1cf0210a9f062325db27e16c035a/zugezaguwavopufenuvetuz.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/tutarevisisalomorazoze.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/biwove.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_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 11172 bytes
SHA-256: 8fd40d16f746d0ca9561988e2c6e414d64d46f159181cc6f9077610ecdc766b7
font_02_sfnt_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 18460 bytes
SHA-256: fa1660f7a492c186c12059760a58e4fee97aedbb57413f127c54efef3709e9b5

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