Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a7c02b5dfdb48b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-21 05:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d47dd32d9d97e6e04c22869b76648f17 SHA-1: 4617cfb91c1e0ff755130cdf6971a9b681f09b29 SHA-256: e1a7c02b5dfdb48bdec293365d26de65ee75deda87682eb4b532bff58cd236ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF's primary function is to act as a lure. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=tamil+songs+mp3+download+app PDF link annotation
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3bfd08c4---tukoteviwanaburibez.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/jewodox.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210903_165613.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210916_66C28FE282D93DDF.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/bilakezobazoxewelaso.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/30018641116.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/veliruronupewowe.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/sesokafu.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/41441562682.pdfIn PDF document text
    • https://arerp.kr/data/file///kinuwufojujubisek.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/68259229856.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131f77e10c41---vuxumobumirasimenivi.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/gasemotaxi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0uln4ul28t5f18lmqge365968s/34532681677.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/79047803867.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/041327095684.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/gamamonuvugib.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/xarixizedaj.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/53980034191.pdfIn PDF document text
    • http://med-os.com/user_upload/file/17360585916.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/duguzapipezirufojelen.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/88721726373.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/4918687005.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/99400467109.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140d82e06e11---jajaripilo.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_off0000b09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09C 10624 bytes
SHA-256: 813705ac19ac7271affb9725362c32a5e7788dd75e101f30691b1c3e1d53f1ec
font_01_sfnt_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 14576 bytes
SHA-256: d874a5bc423fed6451f3848de036c8432b8b8b753bb639bdaa05057b57e117e6
font_02_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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