Malicious PDF — malware analysis report

Static analysis result for SHA-256 686d2b0794b77bf1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 15:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e08d9d156f3f6223e47c598bcca01b71 SHA-1: 0137acef86a73eb5c5d7170c88c51f085301beda SHA-256: 686d2b0794b77bf16c306c4d7e99fc7332822d3643d73b8e39843292468f97da
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits multiple high-severity heuristic firings related to external URL links, including links to compromised CMS uploads and link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the numerous external links suggest the PDF's primary function is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ganganagardentist.com/userfiles/file/jijabomebetola.pdf In PDF document text
    • https://tipresentoio.it/images/file/kutawalilakebilizis.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/19327909335.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/99734217564.pdfIn PDF document text
    • http://progetec.org/userfiles/files/vanivev.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/nccoi4nh8ul3kjmttkvg3738pq/29838521717.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/10171858912.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b156ab4c29---55890891716.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fab753fa8---zedipugiweliwuvami.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/45242573265.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/dopowibilofanix.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/zelaxusazudirodugiguzugom.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab9c4cc4bf---96668241439.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/jabubojipiroguputimeramu.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/lapez.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/20403318723.pdfIn PDF document text
    • http://toonesk.com/upload/99182347689.pdfIn PDF document text
    • https://network-italia.it/file/pavolirobisikeg.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/savudad.pdfIn PDF document text
    • http://rld-carbon.ru/file/lawezojegokar.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/wimikufinubidogam.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/saxubezipawe.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c539a23a751---petopol.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/nituwomuvuva.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xovixutotibojerepu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af5fd7008a2---91134764927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=understanding+non+verbal+communication+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_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 11276 bytes
SHA-256: e9eba0744e8127b824aefeed4d82f74aa500e6616efa849519d7df77d101a38e
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 16624 bytes
SHA-256: 0721a68f9fc1fc24c8f91cb192dcdf2302db72945a1e6f2d611c92c61684ed3b
font_02_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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