Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef44fd82e2ea618…

MALICIOUS

PDF

86.5 KB Created: 2021-07-21 21:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 061fe3dd2f36e92b93e05d11cf431c13 SHA-1: fc72304924037b2e04b957eb92fa15f07fc7675f SHA-256: aef44fd82e2ea618651ea1563dd11e4e57d857fd6ef581bffb173d7780108a6f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://neenah1976.com/clients/17995/File/12865424895.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3b7ee4c2f3e607b54ed9f9841cd583f6/sigekobajobawatifowape.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5664eeb9e4---11340909919.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9081f545b2---35638812231.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da51e54d87---fepexaditumiki.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/felosasanuvedazeb.pdf
    • http://land89.com/ckupload/files/kidolojufa.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922a1cdca6b---geneduvunexotoveke.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c199b0cac---nerugodubatiwuropevonoxud.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096adc1378cc---79461610549.pdf
    • http://kbchina.de/upload/tivadodadozexadiwotiwojav.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/binexirivanavij.pdf
    • https://toocapen.com/files/81181523105.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a3058bcf74b---46771681985.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c430dd44---58863946409.pdf
    • https://schlosshotel-murten.ch/userfiles/files/jibufaxefagab.pdf
    • http://nsureunion.com/clients/71556/File/valebos.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/tepir9l9rhlp5f4vbbtd8mrro6/vapijex.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/39453674127.pdf
    • https://bouveau-consulting.com/userfiles/file/48071284498.pdf
    • http://chixue.com/uploadfile/file/20210702105825.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=convert+video_ts+to+mp4+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efba.bin
b394c66a9d911cbfe89856cba2bc0d2207c79176710694ee4fd11210e8e2d569
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 16796 bytes
font_01_sfnt_off00011b7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 16792 bytes
font_02_sfnt_off00013395.bin
c3f51c82e003e08cd85352e8c23ac7275b873e42bc809871b4a3bcd50617eab8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13395 10596 bytes