Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dd7edd848a0524…

MALICIOUS

PDF

90.0 KB Created: 2021-07-25 02:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adc32fc00ffbda980be8c6954a6c039b SHA-1: cd06e531d47d0db42e1fe73f088dd7c31e8965ee SHA-256: 97dd7edd848a052423741d595c28d39a371cb93bc67d0a9ecb854523e0d69186
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure itself does not contain readable content, but the presence of external links and the overall detection profile strongly suggest it's used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://esejsc.com/upload/files/fufifotorifagowozobu.pdf
    • https://adepotcustom.com/UploadFiles/file/20210503015424106.pdf
    • http://alliance-ic.ru/uploads/file/35214391357.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6c997d5ca---24133965881.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb918e051dd---lawutemosorimelup.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6771279a0d---39961219581.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210703_D6DA5927FE9CEAA7.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/9uf05rntip0390lklpuacoke4j/vutedutisabojiluw.pdf
    • http://usaoxin.com/userfiles/2021-7/file/nemixekoxeduwozaz.pdf
    • http://cokhitienvuong.com/uploads/files/78060666834.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/f0fa7a8f87133177d0de52a13a964ebd/11955395792.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9c8c0810---97897720680.pdf
    • https://www.crqp.ch/ck/ckfinder/userfiles/files/62079384669.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cer4vfl9uohgsef364b66sgv3/91703090262.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd5f72ac6---janegesiwugopi.pdf
    • http://tofuyatogo.com/uploads/files/rigosutofekiwalofifaxo.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0ccc6124221b26abbc0e7db55f3a3020/wudeduvovomederivo.pdf
    • http://arablift.net/userfiles/file/xetotosutorifesidu.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a402a412e---paxapore.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e0a7de423---75967176906.pdf
    • https://prestinieurope.ch/userfiles/files/27846072564.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/62c7148bc50a99e5f0d73ac182f6a48c/70399757694.pdf
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/pugugifurifokegumalana.pdf
    • https://feltshoe.com/userfiles/file/45899898773.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e405cfbfdd235354d4f02fc28485631d/kuparasikitenuta.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea2808b724---56808356460.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ddccac90---80328811364.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+access+deleted+text+messages+verizon
    • 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_off0000f8f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16792 bytes
font_01_sfnt_off00011108.bin
4d6633910a993c1332dd60797fd5eea9ae3dd2bc466708a7b825a7afcd2db9c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 16900 bytes
font_02_sfnt_off00013d1a.bin
782a8a36dd5f3ac8ececdb8af1f073da77ca254f5489086a849263533e966e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1A 11184 bytes

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