Malicious PDF — malware analysis report

Static analysis result for SHA-256 782fccc734f2e254…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 16:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3db7f6467eee891674c78d3038529d4c SHA-1: 99726efe003649a810708d20cadc2141178a5730 SHA-256: 782fccc734f2e25425bf126e7da9b24bc8be3bf4aa1975cd27886044f4632437
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=taxonomia+de+checkland+pdf PDF link annotation
    • http://clickvay.com/upload/files/kiduzo.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/xibejiwamogikopogalabi.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///68137091919.pdfIn PDF document text
    • https://85097781.com/upload/files/gagapesorapus.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/87472549986.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c7a8ea245de798cfcb10ba91fe7008cd/fafukudeluxa.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/43235937357.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/lizer.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/85833445592.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/77824907367.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/6624676909.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/59435033774.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/mudebi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143f37c625f3---buxijixupisa.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/91713266246.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/53394789751.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/11128607015.pdfIn PDF document text
    • http://grandfiltr.com/files/file/24024874116.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/juzugofikovekomiwese.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/42117070579.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c43f7fe66---dutisos.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/lezivobomi.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/binexedujisipukifop.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_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 18212 bytes
SHA-256: 367fe8fe6ef5f56c95838ca00625923f938db8876b6fa39473e5a47b64593b05
font_02_sfnt_off00011af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 10676 bytes
SHA-256: 0e004b78b2a4e6b5e637d24e5c359ac740bcf25c89b9d6012fddcef08ada38bf