Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf01ac63a7f2b1b5…

MALICIOUS

PDF

79.9 KB Created: 2021-07-03 03:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5909f09c0018b741acf8d0fc0fa9a2b5 SHA-1: 734e487f4bb30d8e9a92e908b8167675c10710e2 SHA-256: bf01ac63a7f2b1b582be04563c65ca3029d3a2068a0bde94d5b7f0ca088dd6e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d1ff91d96---43651416246.pdf
    • https://pacpartner.net/images_client//imagesfile/70592493836.pdf
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/42858692694.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46985d60cc---fawetizepukapakawir.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/go1jn23ghpt5j31oqf0lg1q8q4/34391374595.pdf
    • http://brezov-gaj.si/uporabnik/file/ziwanajomujaxixikimen.pdf
    • http://sartor.ru/upload/files/29662784762.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881a8003574---tovavipejegilabivatu.pdf
    • http://crosswaysrecruitment.com/userfiles/file/gowovigiwigegijonekukibaz.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec0fe1b47---tigezamimuxexit.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fce7bc60af---jegowotorenijurelufap.pdf
    • http://ffarchitettura.it/userfiles/files/darebigodoxatera.pdf
    • http://songiadahoaian.com/upload/ck/files/memekaborifujizikoliz.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9edf22a46---tuvepifo.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/90703485506.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/noguwiwejapef.pdf
    • http://nutronicltd.com/userfiles/file/fetorutoxutebin.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/26e232ef1b59b8c24fa19e3c1a669272/busakoginemuba.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e2f0c3f13---getugiruzajimesidatota.pdf
    • http://niszczeniewaw.pl/userfiles/file/90026559827.pdf
    • http://christschoolblr.in/userfiles/file/warotu.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/adaa9c6dcb1ad5b14600993282e7d8d2/foxakitufafejejirewavix.pdf
    • http://derma-dts.de/files/file/56118375524.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607446df58140---famemotagamokogagivoba.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd93f72858---80081977228.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+girl+on+the+train+pdf+archive
    • 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_off0000d425.bin
fc879dda3be7f0e31e35ccc0b8203012eef429356045849e89cc58d99eb3cf92
pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 17408 bytes
font_01_sfnt_off000101bc.bin
994049b68c3fd47a6b1bb7f85e118e870179581a85a35cb74a2158e30298ae34
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 10760 bytes
font_02_sfnt_off00011a39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 16792 bytes