Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bb6ad6ad3ca9b8…

MALICIOUS

PDF

83.1 KB Created: 2021-10-17 18:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b768c682f3e3254447a22769080292b6 SHA-1: 5d7b99ece6eff402adc003e397f4f7d9efcea309 SHA-256: a3bb6ad6ad3ca9b8426f3c974a00c9d689b09ecfef7acd4fef718ec0ea6333ed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://eakqshop.com/ckfinder/images_store/files/fasigakubem.pdf In PDF document text
    • http://moriefrusca.com/userfiles/files/13209660766.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/45330672479.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/donemugid.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161698d85423b0---41121410115.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/48860558116.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/20280181139.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/tulagarubupepopufax.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/gajasigupogemowafowivarow.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/judunexagewi.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/26939345683.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/25560715892.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/kudebirubezezijenafe.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/7397531593.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/munuzazozasorepa.pdfIn PDF document text
    • http://naviway.su/upload/files/20466339984.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/1041720056.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d48dbd6364af905c4f0d1bcb2595b077/tirar.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e65e691e---73828171330.pdfIn PDF document text
    • http://msiutilities.biz/documents/14616283415.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/jasemamisajufaruzi.pdfIn PDF document text
    • http://jonme.net/ckupload/files/16776683531.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/xopevujimut.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=an+acrostic+poem+on+motherPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 18180 bytes
SHA-256: 623f1e13cf390f8ec7e1cd146c9a623818e7167a50b484de86bcaba3ae81d83e
font_01_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 10572 bytes
SHA-256: 3a155cb60977761ac3799f4b59de007fa87c88743b3b839339f42a042e271087
font_02_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1