Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a612ab0cbd89ea…

MALICIOUS

PDF

88.5 KB Created: 2021-09-14 06:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b81999ae9fad98e7e7732b75abac67c5 SHA-1: 5583d7e735b5492cbe5ca7ecfdaa7b038b64ebd8 SHA-256: 38a612ab0cbd89ea2c6d0519fc534e2986168c2e6e46b4adab58b75da58a6fe1
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and link farms on disposable hosting, suggests it is designed to redirect users to malicious sites. The heuristics also indicate the document uses urgency lures and QR code redirection, common tactics in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=how+to+share+location+iphone+to+android PDF link annotation
    • http://yjccnc.com/upload/files/samazozikipi.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/81728151402.pdfIn PDF document text
    • http://webs123.com/userfiles/file/silidoserujelu.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/71800564299.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210913000456.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/janubipejasoguzigutap.pdfIn PDF document text
    • https://arerp.kr/data/file///zapajiken.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/50487027155.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9ddbae55---40779824896.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/92391008833.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933a8870a9---fopiredolurezu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d38024e59---puwedikosifametekirij.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/fanudurufumapi.pdfIn PDF document text
    • http://eventechsite.com/files/files/29480569395.pdfIn PDF document text
    • https://isosklo.cz/uploads/1608961289.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/bugewizelisi.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/90128207723.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/28497092842.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/61444223051.pdfIn PDF document text
    • http://hotechike.com/files/files/92197336331.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6c105fc7bec6b90869da94b131d84bf6/85023123676.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/lirogikob.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/65570376899.pdfIn PDF document text
    • http://vhz.cz/user-files/55246407.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_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 10688 bytes
SHA-256: dfd6b51b2d57701d4019b2d5d2c5d0a808ac2d1e20d4725b2dbdc04554072a08
font_01_sfnt_off00010f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 17656 bytes
SHA-256: 76b65bf53b43223168d0a94ad825cffb4fd27774de41279e1533363bf8291548
font_02_sfnt_off00013c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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