Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90bc18d8cb1c59f…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 00:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c4ee48f32724220a8be4922aae8a029 SHA-1: 3f5f594363f223c640928461c76d40f7ba2564dd SHA-256: d90bc18d8cb1c59fc89d06c15c1fc22fc25adc63f4925fd4530d9e06f809fbf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on compromised WordPress installations or disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=real+estate+agent+tax+deductions
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89cf05cf6d---nevix.pdf
    • http://dulichgiahy.com/upload/file/rixovasagezexadisap.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0046e2578---nofejos.pdf
    • https://ceccargiurgiu.ro/userfiles/file/72739006388.pdf
    • https://aduanaldelvalle.com/userfiles/file/1293986381.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/847qqet1i9l3e8g8s70f868uc2/zedirodepiduloxirulunuri.pdf
    • http://stellamaris.cz/userfiles/14055353441.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20ad12d66f---bekosavetetulelegujekak.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce7db3926---kabokaz.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/jbcdkfto96nhdi2tao6oojku2b/votazukogate.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cffdaccd0---lofaroguvas.pdf
    • https://chp-travel.ir/data/file/13577224245.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d13179d5f---2675460994.pdf
    • https://glycocalyx.nl/userfiles/image/file/90824538036.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b300cf21ed0---rimofilenafanap.pdf
    • http://jar-ted.pl/file/bakemetuwakotirukik.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b22e18f57---xukumefulilowifewo.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a324b91c---dexolilodit.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2ac21bce94963d9c192592ce276f9139/1161030049.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1cbb49848---xivavozujenosatesusu.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabb06970e---22470865876.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/taruxo.pdf
    • https://bruceautoservice.com/files/file/tojawexewuxugaburagikuvob.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/6q2sup2kvop7001hv1fmaqjeir/18306696389.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/genuduvakifusegiji.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b597ee6f182---18408747898.pdf
    • https://activepymes.com/pub/file/8956459782.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_off0000f329.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 16792 bytes
font_01_sfnt_off00010b3b.bin
940cec97c3fc94698b2e6ba24f4b7ee4ba83c21d744f5c1b3b679b04887d41fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 16396 bytes
font_02_sfnt_off000135b4.bin
75e1e823b43b0d68f6f076f2261b525463147db8205803272caa044abe02fc75
pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 10692 bytes