Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2fe17cb7be3528…

MALICIOUS

PDF

105.9 KB Created: 2021-07-01 14:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7376cfa36150eedd7df1711da7143ab8 SHA-1: 120cecf0534511d40995629fdb271b3e5995b430 SHA-256: 4e2fe17cb7be3528caeea32762b6af450fe1e096aa796c14d28551ad4ed642ae
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links on potentially compromised infrastructure suggests a broad campaign to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bf1e616ea30570d2b37730ba893221f7/36674958761.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0a2cfde633dab515c404fcdb53cf8e75/90922363731.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160904c22adc84---61886547366.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ef34c6d60---domovu.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16090e45e5d985---vibubu.pdf
    • https://tenfci.org/userfiles/file/lonogununivipalotawibi.pdf
    • http://kasargod.net/uploads/file/sagolesotumulukekurik.pdf
    • http://toonesk.com/upload/58737089854.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2972f35f0a940eab322d2ecb31b9aa3/sufezopowoxezusewoguvur.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8bd7fc31---senubonosisemup.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/jc2jnkpupb01rq605sdoeqo2h4/giwatidepuvujuxule.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab0c469fd---35474271845.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080364e03381---bedafobik.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27482f2d2d---16381896084.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9713f470---38607449309.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a932fd3dafd---xelubiza.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1frgqb9e75e4023tk705p5s50n/kugikozowa.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e830680843---jipefatewax.pdf
    • https://topclassgardening.nl/images/file/729109718.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fbad404ab---radixaxinarumesagowo.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3f2e61060977502370a831891342359f/xorinevodubonat.pdf
    • http://araonline.hu/uploads/file/15395113261.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/alcrgd1onnscesk4bik0jaaok7/92436181587.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/jumatoku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+great+rat+hunt+questions+and+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001248c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16792 bytes
font_01_sfnt_off00013c9d.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9D 16252 bytes
font_02_sfnt_off00015279.bin
e63175300318704e2fe697af2cf62c71183bc7bfe80ef1b69dfc163349eb92e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15279 18368 bytes
font_03_sfnt_off00018267.bin
02f4c9a1fc90b2be3309e5bbd1ba40510f9380fbcfad7ba4d787fa0ff14e2875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18267 10776 bytes

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