Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3aa67c0c07d3646…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 15:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 444cd58d84f33571806cadfd19c03989 SHA-1: 444c2d2aaf1fae5b4f4f0f9736be8090328f45be SHA-256: c3aa67c0c07d364609ac8ecd69e17f46c1fbb7089ade7a8e2af81a773963b459
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://stancijanegrin.com/UserFiles/files/54960751454.pdf In PDF document text
    • https://newline-eg.com/userfiles/file/79608330002.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613889b9ab220---talewarusomub.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/13413099598.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/13207110831.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/xeditomunegozum.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/94472680653.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/tibarizifizepimiruxoje.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///49120295991.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/75169249978.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613058ee7f19a---jizeviritatenoguretiwozu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9fadd25b---waxubesemipibax.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/59613030278.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/devamusevizosivejuxozube.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/36031259268.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/xamilagobevekemugikuges.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/51744482771.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ebe131909---47009994549.pdfIn PDF document text
    • https://btegypt.com/file/25022814396.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/15305027648.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/badijulanulovamafiwiruxe.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/tarapujifenikepiluv.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/42094782856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=getting+over+it+online+unblockedPDF 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_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 10652 bytes
SHA-256: 7cb0bb84ca94863153b2fd02001d054dce38407644de2ecdc2dd045b498944bf
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 17380 bytes
SHA-256: ce385855a2917b9ac0e5f1a3d33e503497799726c07cb40ef1f01282f911ce86
font_02_sfnt_off00012645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1