Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcc276f84e1a3c0…

MALICIOUS

PDF

68.9 KB Created: 2021-09-20 19:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7f8318d3d27e2055978af130371c96d SHA-1: 41cf2c34823b9254f1ec64a5578935c7e113b99f SHA-256: fbcc276f84e1a3c0a03542467ac0850fadab631fcbeb033c1ed53993f141fe76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or scam campaigns. No scripts were extracted, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=injustice+gods+among+us+apk PDF link annotation
    • https://butagallery.com/userfiles/files/dixaweriduwufoledepevak.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109080428293776980m7rc5.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7014465571.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/20963617227.pdfIn PDF document text
    • https://makenie.com/upload/files/7610579602.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/72204032242.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/xunisuberunopisegiba.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136eef764148---naxesibukupo.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/96370287663.pdfIn PDF document text
    • https://www.confirmedtour.com/files/nuzul.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/mradfg5pc4qcfds52d4vq42q23/16935177547.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/rupisebeperilitipulamon.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2goda8s13dbon5tarscjgfmk16/kuxegurelenegominidekorul.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/siwuvusep.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/33293173024.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vixoxibix.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/bogisurulevarezomata.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/26919854809.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/44567618473.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/womuzikal.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/tajadas.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/lapimazupuretitux.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f6e9d2702---78851439751.pdfIn PDF document text
    • 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_off0000af04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71B 10984 bytes
SHA-256: ef8bd731cead20737773c9ae1c3b2e9e9a90eda82e06c5a9a2f8a0ff3e67fef9
font_02_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 14968 bytes
SHA-256: 89bafdb3fb2f028dba367604cf9bf8f76ffda711df9037ed63d532113eaa92c5