Malicious PDF — malware analysis report

Static analysis result for SHA-256 b103f4c4434341fb…

MALICIOUS

PDF

89.0 KB Created: 2021-09-13 07:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce01e47af3fccbe9d38e0d74ab7354f7 SHA-1: bba738b9cbc1f3a79e0ea4bdbb62e1711b76431c SHA-256: b103f4c4434341fb5732c53eff7dbe890d8b5d9cc8709ba2decf16d0e94684e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution lure.

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.
  • 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
  • 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://medvor.ru/uplcv?utm_term=how+to+get+voicemail+back+on+android PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/klmmi0q2mttg7thp4ntoppqdup/libipowev.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/88400786083.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/nogule.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/66245768003.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7eb567ccce51f4a82cc870fd770d9043/kusuf.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/botexiz.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/71894996975.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/89497726495.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/vilumo.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/77107592838.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/84559904404.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/bijofeba.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/sepikejegu.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xenotenodagikanigowewef.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/15745413795.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/pigarikumedafuf.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8f47021b---jolodolizeverikuxulo.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/mikozedijilaziwu.pdfIn PDF document text
    • http://biosite.ru/images/news/file/fesuvo.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/13384896264.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/64207262345.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/95487059601.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/gelitona.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/41539745988.pdfIn PDF document text
    • http://linza-market.ru/upload/files/12445992827.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_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 17808 bytes
SHA-256: 6fbf884922f491f38a1d5d8e1f2842909842a5f8480103e4f93ee596afe97f4e
font_02_sfnt_off00013d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0C 10920 bytes
SHA-256: 962a73de8095672b75d459ec34e4c964898a4e290478ed527b155f61a7c21f4f

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