Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f2de3bab2a92cd…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 19:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 639cbb7374af2ffb641f9168cc252fe7 SHA-1: dc310570d045a9c24b30ea296311eb797c40b783 SHA-256: b5f2de3bab2a92cdf0f90d84f6c28f2656adcfc88219f84b0c0875b57630bccd
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to redirect users to malicious content. The document's structure and heuristic firings strongly indicate a phishing attack leveraging external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://hzosm.com/images/upload/File/65285468561.pdf In PDF document text
    • http://stellarp.com/userfiles/file/79530233352.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/9468691092.pdfIn PDF document text
    • http://nincity.de/inline/file/vexutelobokowogojabopej.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/75925585930.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327ec59f1f3---luninixe.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/gudurivejatajile.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/25365635118.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/87620537060.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/xapezewituvata.pdfIn PDF document text
    • http://qdjshg.com/files/file/godewisoberu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b5f966a679e79cf01321c96ce57491ea/41430011282.pdfIn PDF document text
    • http://grandfiltr.com/files/file/zopovivipobusejoxavop.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/wagupetukurixodutoxa.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1de95545f5effae2d366551a495e72c3/gufejepasokatuwe.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/nanufewexodaxin.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/vobulogosepiku.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409c8def02c---41195368512.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/22672928733.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/xudimelaxug.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/56263442934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=office+365+portal+pagePDF 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_off0000b020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC832 14408 bytes
SHA-256: a2bcb3bc70d34a37b28114db195dcdb09f2e232f22b65c69c3703128d0c52177
font_02_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 10880 bytes
SHA-256: 99442b614c0ebe21022f62e1cc0b90ed442ad9b30096a3b4b688daa893ad2461

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