Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1c973fdfb448f4…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 23:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abdf32aec78cc8b1e24022377d3b4f4d SHA-1: 1f6eeb9ea8afd835ac246d29655b6681b3b09d28 SHA-256: 0d1c973fdfb448f4ae6bd272c0e41ed782e5383ca25a133c8e6c8f02b660bc50
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/be9d72a0d655e89cef3fa724d46c82d7/32507096815.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b0050e77c---93776642251.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/97696220000.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/vizarulilegigo.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/14258873014.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/famezaviboj.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/xijavike.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/29226300826.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/varajameku.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed80182d6f---pilad.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/1378379947.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/10349026386.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/7308342282.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630823701/files/getenokewujulotixivuw.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/ludaluneniwavixorinodopej.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/71003425065.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/39440079657.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/78938548794.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210912203814.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/83399419077.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/68814075788.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/xumadipazubidi.pdfIn PDF document text
    • http://deltools.com/userfiles/file/63954216382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ps5+iptv+playerPDF 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_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 10336 bytes
SHA-256: 757d71d400f15f856f5a6781e29600c1708caf2a62fb65b3f5296e1e285eee54
font_01_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 18060 bytes
SHA-256: b25efb64eb436a5b373e46c55bbb20551faa88617ce6d2e39a18c5e61231f0d2
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1