Malicious PDF — malware analysis report

Static analysis result for SHA-256 144d0bdc9bbe21c9…

MALICIOUS

PDF

69.4 KB Created: 2021-09-20 17:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ffa42c101c21e0c4b3661530d1bc20fb SHA-1: e3855b34ee707b0c0fdd95c542251a11360a457d SHA-256: 144d0bdc9bbe21c941782ca86050fb787974615c97a6dacf7f3ef8fee24f4e9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613558ddf0377---jeweresufoxo.pdf In PDF document text
    • https://pakistanchristiancongress.pakistanchristianpost.com/userfiles/file/rokavasupibovuwuru.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/46618320276.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/56380531919.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/36187274271.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/govozobeduvowojitadelute.pdfIn PDF document text
    • https://fasleh.net/Files/files/25121486461.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/zizewixisefusareju.pdfIn PDF document text
    • https://scalper.ir/data/files/file/webafubolazowotepafaj.pdfIn PDF document text
    • http://wdnederland.nl/file/vijisemewagid.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/xelagasobiwuza.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450da969efd---16796889928.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/leroromewavenexe.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/venegega.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/pemudoniwiwupuzimof.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/muwesisadaligot.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eadb17614---68099326475.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/mudonoxigozuwururi.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/vuvibevobugokekoxufo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613129ff630b9---69045860910.pdfIn PDF document text
    • http://gotween.com/userfiles/file///38042102765.pdfIn PDF document text
    • https://reniuved.it/file/gutixatubodakekobakorek.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/deludasegakejumagekob.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/pakevekoradobopixo.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/60171687146.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/62361966970.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/kezejevagijuvekibupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=army+toys+town+mod+apkPDF link annotation
    • 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_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 14344 bytes
SHA-256: 2652178960afc4a67b858d4b5fcdc133d6ce5c945a38c421549610966e099180
font_01_sfnt_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 10556 bytes
SHA-256: 4379e9536893af28ec176a6aef0607da0ddedf53fb346604cd7351b001c2c697
font_02_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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