Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0c95161431504d…

MALICIOUS

PDF

96.8 KB Created: 2021-09-17 21:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27cb4258f998cebf50de9bfe9e5eebcc SHA-1: fcde3b95a644e0d1d508fd595c6d93d8248ff2b0 SHA-256: 1d0c95161431504d65c2616ad526d0668c1c446739ffad56a753376aa9232e73
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts social engineering by prompting the user to install a browser extension or update. Numerous URLs are present, many pointing to link farms on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which may be used to facilitate the download and execution of further 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wastran.ru/uplcv?utm_term=android+10+sip+client PDF link annotation
    • http://engineersclasses4competition.com/files/others/bugikewuk.pdfIn PDF document text
    • http://actinq.nl/upload/file/winudoxola.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/jolujelulazo.pdfIn PDF document text
    • http://farmina.ru/uploads/files/zefusugugijafito.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/56553455986.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219924971553.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/gowuvuvi.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/tixopav.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/22664441936.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/26511338051.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mei9uuvfqds13r1315treo0ji5/kevivevomebogebexowam.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/56414575155.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/wirozaxo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62885823e---3067028979.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/13021484386.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/24751333536.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/78511480856.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1cd5bcde9989b08a4e9bdfd629a5ca56/98945992541.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/menojeli.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/60504930193.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/bipuk.pdfIn PDF document text
    • https://maturana.cl/upload/file/2021207664.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/76992762620.pdfIn PDF document text
    • https://motoralbini.it/files/file/15529518427.pdfIn PDF document text
    • 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_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 10500 bytes
SHA-256: d8de9a092156a3a54efeee1c5d269168e56bf5ee1ef6b4e763200f4a5dcf7947
font_01_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14668 18060 bytes
SHA-256: 47f0850089b62d40124ac6c79295cc51007d364c7328b2c92e5e70db8bb6bf9e

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