Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cae6d0d8c17d01…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 04:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 33125b7dfae67a04838c7bcf23c0959c SHA-1: 7f65239915b6c729c0705208971444d502b4fd03 SHA-256: 56cae6d0d8c17d010838cc54ab13243349df97a4d9d81f31f4ebe8c78c602862
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, and it contains a QR code lure instructing the user to scan it with a phone. This suggests the document's primary purpose is to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://krukaiart.com/userfiles/files/57001408772.pdf In PDF document text
    • http://hanboo.cn/Uploads/file/2021090722191270554.pdfIn PDF document text
    • http://bptramptour.pl/files/file/97852153030.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/paxosukumekipetosa.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/duxuvaterumasubiwalijoso.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/93297773939.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/vaxarijerapobusapofukup.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/bomijezotuwazetefuba.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161385e7e3a324---79442881151.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/radolimetiwuborekavajo.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/fokunirenupeduwolazo.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/zodikepatej.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/jizamefunorijavipodo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a43f05cda---panowili.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/aa11b416add34feedc9235a536aa0a5c/maninubu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b32b4f1ea1---wonilo.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/29978701701.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hfs4lrbve5f49t2ac11qeb1c97/wofosubulenarajuvufujezoj.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/sazobevesujujutisijagilo.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/xedomafeviporobapugononim.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/nijovodajovere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+scan+qr+code+with+android+smartphonePDF 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_off0000c6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FC 10956 bytes
SHA-256: 97ae76eca1c346d7839bed199805a2bd9b4e3f46b3e9545940ad0a740922498b
font_01_sfnt_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 17764 bytes
SHA-256: 82bd3721365fff1f92ed7d63489c30869c2b0336eeff9a0391153c0482ae1555

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