Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffed30c0cc4dc778…

MALICIOUS

PDF

93.1 KB Created: 2021-09-07 04:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a01c718ac5a78515abb2e3337b7f183 SHA-1: b9e1020859a673631949b16dbed92218505df0aa SHA-256: ffed30c0cc4dc778744bba9f4e2baa374a071627f7bffea99f158dc6e7e56c63
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristic firings point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://asfalon.com/__files/file/76396818007.pdf In PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b59f2e65ee8---7466176741.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/toruzosaxulifaxoru.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/dopogewedunal.pdfIn PDF document text
    • http://etre-belle.su/images/file/31746862327.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/14348175205.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ln39megu3tsi8t24vhcn64kpfj/97603000417.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161000521b64cb---xodifufazavuton.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vetuxadapuralidezoxenabut.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/172170f0de39333c4c5042f858a8de1c/xeret.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/torogesamopok.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c1b83d9bb---pokigazepa.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/55946737558.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/fesimego.pdfIn PDF document text
    • https://podimercrm.com/img/files/46262585551.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/loxodajatejewoxerubukimop.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/digemixufatibenerir.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/93321896056.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/42826810799.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8fbb35f99---sifete.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/bamagepofudujene.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/22780267128.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/sdmt61922l2r1f64fru15j43m5/17853437012.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/53583100556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=apomixis+in+plants+pdfPDF 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_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 10508 bytes
SHA-256: a5a7c88d39b0d76a77840fe3389d205edfbbf29082b2d518e047a74616c75c7e
font_01_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 20652 bytes
SHA-256: ca762b06f0a4eeb5458c5de4a575847b5443d2a71eac169de4ebec9850916b48
font_02_sfnt_off00014e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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