Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f25208fbc66566…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 08:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 966f497662121d4087a4658153ed08a7 SHA-1: 223963bce1dd49eecbfbaaae26530bb06774affb SHA-256: 15f25208fbc66566cbf62188909eaa0cc2763c4f154ef491aac5853596ac050e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://elpollopaulino.com/cenavarra_userfiles/files/dizogovulurigupamoxoxopop.pdf In PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/26632468551.pdfIn PDF document text
    • https://lazerom.pro/media/file/36922235310.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/pijisodowesolaja.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/62694608106.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/234075645327398623cca20493e68395/13373444080.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/53642822504.pdfIn PDF document text
    • http://yuha.be/_files/file/2605921328.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161443bda427ad---32447098024.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/51808521870.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/mobewuri.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/ponubam.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/70761299893.pdfIn PDF document text
    • http://minipit.com/data/files/suroberefudi.pdfIn PDF document text
    • http://slsnn.ru/content/file/11727002185.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/19583711835.pdfIn PDF document text
    • http://slsnn.ru/content/files/47817500213.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/pezava.pdfPDF link annotation
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16142c093040f0---kisiragusuforabokomu.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/siwifixotes.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210913073255.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/zowipom.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/25375575035.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/mijubatopeguju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=rich+dad+poor+dad+kindle+downloadPDF 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_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 10568 bytes
SHA-256: f1609f8cec89a29ac7a5302790a66c563c5bf7dde9b62229ef948d503ea5636f
font_01_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 17204 bytes
SHA-256: e4ddcb5f0f3ed1164a202a0b63ca1c5b65b7c693495261f55412ab04bd6631b4
font_02_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1