Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f105ab903650426…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 22:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b136578566d6dcb59b03743e62126820 SHA-1: c00ed06fce151e22cd356bf2c010a51e28e51acb SHA-256: 6f105ab90365042635c7ca8bad284ae044fae0ac251e094c2ff75bb11e35e075
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://terredellamagnagrecia.com/userfiles/files/woxivavabefir.pdf In PDF document text
    • http://secureyun.cn/uploadfile/file///2021082100514376.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/eo11g0c0ugu4pdkdjotdtg3e31/nemasejolutazojuwufid.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0ddce085de2c1ae1705392ab64b255fc/31689440211.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/auuccjg6ekp36vfu11nc063m7i/7803655815.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/f0f8ru4ti6p8ejmdehurisf9l7/rovibivuditomuvapetoxiluv.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/puxivun.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/bagekamutipekuda.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zedemasadakatoduboladow.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/90665580589.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/20119687364.pdfIn PDF document text
    • http://jp-cable.com/d/files/jesosadofinime.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b2aa088e61a858fb5d9646f206dadfad/samidip.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/73fe439107d3db82b9f4ee65c5f04e13/34029594153.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/73a2fd249f3762101b61a7cc8151ed90/sozekexilegumudetew.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/sizewawiwe.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/10648472156.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/naditaxotexakafo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608b925d443f0---sipojizowoxas.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a566f39427b---15731783953.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef6f146e31---52861830523.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/wetujopapilimanozubomu.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/zomaxuzekawawafidofero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+spoken+english+books+in+kannada+pdfPDF 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_off0000c78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78F 10900 bytes
SHA-256: 6749ad92b7c4fed4969a1e99355f3b52ae0a392edcb1bc47f557968456691c75
font_01_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 17692 bytes
SHA-256: 237f1ffa799010d5cf8d56618746eda3f4cfe37dfa81f28455bf659d4e330e6b

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