Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d24729e517b0e8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 18:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ed8684c1f48b9b7014d912160ae0a5d SHA-1: 7a64e4a6138adc927201cdc1c1064434598e262d SHA-256: 34d24729e517b0e88098ba78da07ae11859d1e99c104c048522926d1402ce39e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm or hosting malicious content on compromised websites. The presence of external URIs, including one pointing to a raw IP address, suggests an attempt to redirect the user to a malicious site. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may exploit PDF vulnerabilities or contain embedded malicious JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870e8b0bfd9---64820032737.pdf In PDF document text
    • https://camgloberealtor.com/userfiles/file/tokuzamezep.pdfIn PDF document text
    • http://premo.at/userfiles/file/jegexifujaninuben.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202108200726377164.pdfIn PDF document text
    • http://princeverma.in/uploads/files/74520089434.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/wujuka.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zufijuzoki.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/wijuwologini.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8017dc3f7e---gomomupunatexaxogujogose.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/penajojowefugokubuseti.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/33635925640.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/2444120567.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42110c619---fukadetimawaregazole.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/46034896236.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e102faf6aa---38498638598.pdfIn PDF document text
    • http://vit-physio.de/file/1361419056.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/rovekewa.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/zabenu.pdfPDF link annotation
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/kabog.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/suxadit.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/10549985018.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/849243e717cd1b93e3653fb2059fc598/99086874255.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ad2e742ebb1adce34302ccd827efa562/94578697822.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/17053454650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=flowerhorn+breeding+pdfPDF 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_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 10552 bytes
SHA-256: a7ffbda145f226f7ba9fc00b520fe67b8444d8cc07423ffaeba110284181156c
font_01_sfnt_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 17368 bytes
SHA-256: 6ae2f67cf62238d5d629610c95048b823fe30e63c5932b6e8a4f92d200060d72
font_02_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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