Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee385ddfcea8c56…

MALICIOUS

PDF

101.2 KB Created: 2021-07-02 02:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59d4907d6ab3e8e6e5525dc6777ca8c0 SHA-1: bf58999f8666ea96666da05ca4ccde8b494fe03d SHA-256: dee385ddfcea8c56a167cf40d49b5e667150cc29119a36917b0d2ff7053d05a2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://alphasigmaoverseas.com/userfiles/file/68504165834.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5e632593ae82906d782a40f59ef90eb6/morufivesodidexe.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e517c6dad6432ddea453db34ab929d50/54301564683.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f656234116---saratogez.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613a93694d---22902090149.pdf
    • http://mwflower.com/upimagesfile///rupopol.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1326c591---62026126124.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/54140ab167aa80a784ab8e177113be56/74473802805.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080dcb4e9e2c---35823985199.pdf
    • http://parkhighclassof60.com/clients/871169/File/70792621893.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/dokinujibevikozogovudu.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078300828832---beduxenafej.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2d9b0687---35719212414.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/sarawakuxuvejani.pdf
    • http://atol-res.pl/uploads/file/54104531654.pdf
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/63871122118.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3580cde332---tonesifowebiroviseguk.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/upf92dv54fe488fboiealg0b9r/kofinanad.pdf
    • http://adabaskimerkezi.com/upload/file/53347497306.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/b251fc8c99e9a5c4f5ef50ac2b58c691/13677604309.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0c420aca8f2ca5af6ed4a883672c3a7e/52827674438.pdf
    • https://tonitomov.com/picture/file/sozolanakulut.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/84c250123e41fb9d49e1acbf85060680/bupuz.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/nqsc41tr30k5vv58mf92q4dka9/5517161216.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a615346f8---devakifedi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rick+and+morty+a+way+back+home+summer
    • 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_off0001277f.bin
198b47eae178fa8353982256fd631aaf5ffc51f70e6c3278c6f798f19ecd5546
pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 17452 bytes
font_01_sfnt_off00015537.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15537 16792 bytes
font_02_sfnt_off00016d4e.bin
566f82cd27b88ccd4322c70744c6cc146bd4674914793a9ff328940f83724b27
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D4E 11168 bytes