Malicious PDF — malware analysis report

Static analysis result for SHA-256 136d71c39ca1fb5f…

MALICIOUS

PDF

85.7 KB Created: 2021-07-04 14:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97a5e29ebd73cd261919d18a9a629eb1 SHA-1: d1f3ee597ab4d11aa41a7e13d6a1478696e28edc SHA-256: 136d71c39ca1fb5f59a31e728b460c7637c95ad9809839a9489e234f8e1f16d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=the+logo+quiz+level+3+answers
    • http://www.northern-japan.com/image/upload/File/vivova.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hl58mblfmn367gmi0o3o1n9no4/10519998923.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a3d22c391---67975434375.pdf
    • http://adbuffalony.com/uploads/files/lopaxexunanizaluwobinufe.pdf
    • http://ilovechardonnayhills.com/userimages/lenotisesorebezafa.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d347ddad04---panivimitas.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2207ba3d85---4342256809.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dlcrg4cl839iftnnn99djjhdct/nilevilotusixovoxologul.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc9ef5f11b---xowotodejujeraw.pdf
    • https://limmaginebistrot.com/file/58101869066.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a491af1018f27cc6b592a8c88affdca8/xenoli.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210519132546.pdf
    • https://burlingame.com/wysiwygfiles/file/vomimu.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2sa5tevlpe724vggs50746nv0p/peliron.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608048cf98cd5---wuromoxapoxuwavojiroj.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f919bc76a2fa2ca3822e9ee99a13007a/sulonojorebobi.pdf
    • http://amirafouad.com/uploaded_files/file/36909117494.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ea7117dc60---laduzatediwusepogexi.pdf
    • http://www.aadhar-interior.com/userfiles/file/44144364432.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb4e90b4dc---donefevutajepakuvubika.pdf
    • https://hophamthaibinh.com/upload/files/wojupujegiri.pdf
    • http://bettaletroom.com/file_media/file_image/file/gukararorijiweguxawe.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/51657e2cfd392fbafe102888e7597970/juserelax.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5223493cdffd42c2b7e9389302e3983a/15775642078.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9e.bin
dd2b1983f2e0b024a1e057dc0d4b7fbfcb52614462d18227b36c750b07834668
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 10880 bytes
font_01_sfnt_off00010590.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 16792 bytes
font_02_sfnt_off00011da2.bin
e56758ca7a839fb64ecdd05ab44085d3e6fb2e94eed97550c149ce6cb641cb41
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 16964 bytes