Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7592bec4a6227a2…

MALICIOUS

PDF

124.6 KB Created: 2021-09-02 01:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2efe331ad6a2a8fbef97e1beed756f2f SHA-1: 8dc129e507c18fa78bb6c1ae687205c89387949a SHA-256: c7592bec4a6227a26f3ac60d9b3ff7477361fffba624e4cc0fbc87eaff233944
196 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, forming a link farm. These links likely lead to further malicious content, such as other PDFs or executables, intended to deceive the user. The presence of multiple compromised hosts and a high number of external links suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c867c20f---13130610848.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1dd83e3e6---savosirugepifaro.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/xekogiwulatuximole.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/luwor.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/65175444016.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/96783aa68352e376f76619fe3111d84c/34117415232.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wuliveposalarebulazux.pdfIn PDF document text
    • http://gyobel.itpublic/file/84647785666.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/vgmga8ldsseb5flp9hcgpcdfhd/12224570023.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/de1befa30e5f16b7c7dee69ebe7fc092/18654575449.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/22512811048.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/gawisuboxasavuxolata.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/jetob.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/367b13bb72e204e2ae1e6570bbd518f4/wifukonutane.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/4106140141.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/92609901475.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e57a10df7f24f68842731f6b72c041c4/8734582414.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eff84d54---33482132783.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-17/20210617153220511131.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/wanigapiputatovaruwe.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/jutusidukoxi.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/bce4dc20fae5a69bff84000a9cffb488/95162650787.pdfIn PDF document text
    • http://becucci.it/userfiles/files/82743645638.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb817109b1---53153340907.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/telixofiwof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=praise+the+lord+for+his+love+endures+foreverPDF 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_off00017806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17806 10616 bytes
SHA-256: c05a11ad6e6324c5186c5e1eb41b07d68b186eb2ea0dadfaf5129eb6ee17b282
font_01_sfnt_off0001903d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1903D 22836 bytes
SHA-256: c1c1cc02abbead915804a42801dcadd5d71c5abc679749cfb05a8499a8753d0c
font_02_sfnt_off0001cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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