Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d94b31d9adbfa0…

MALICIOUS

PDF

100.0 KB Created: 2021-07-07 18:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 73b027bb9e1b7f23cd39cb9f5ab3482f SHA-1: b87f74efb6273dd267e24a1942084d1d2be56d66 SHA-256: b5d94b31d9adbfa09ead2a1b5fdc382ba51ff877ad64fc389aae2de94e0b4dc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://bannhuaduong.net/upload/files/11179659007.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41998baac2---kixemuvamuvodida.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210704204322140.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e687c5ce643eeae7f7811c1fef1a51ab/kerupelerodapa.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/befobisadaru.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/j6lddlghkj9nq5sfv8bp04htj2/jubovame.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/1306551038.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/zajos.pdfIn PDF document text
    • https://loctra.net/userfiles/file/wobukimibe.pdfIn PDF document text
    • http://innotack.com/userfiles/files/tajolavubere.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/18811579724.pdfIn PDF document text
    • https://petala.gr/userfiles/file/71568823868.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b52920d58---pifilatutenenilewelil.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/jndtgd630gntiot7aumpn989si/setuko.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210604135807_46112452.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8746ad5a36---fusidinikefetob.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/zegov.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/lemumovurilogometelujoro.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/poputul.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/n2u9g1icjlbptjlgsvlb12tr07/xetovewokivixuwasib.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b085b1a29---fudivizamodezuz.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/towoliriwosogijufutew.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54a2a51814---30851724274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=biblical+meaning+of+dorcasPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000132fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x132FD 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 23948 bytes
SHA-256: 7ef6c7d7504ca23e10bbd265a4260d71ea7b6a9a46e6ce91d1547dfbd19e9383
font_01_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off0001509f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509F 10912 bytes
SHA-256: 2975ae5a6abe7724aace1815e7322760562dabab955c407490d1c7fc907fd0ad
font_04_sfnt_off000169a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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