Malicious PDF — malware analysis report

Static analysis result for SHA-256 62801011e161b84a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 10:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 938e2686534e0f9b77492c044d10b9d8 SHA-1: ee289448d3e27d069f56d1d33d7b09e25de2bff3 SHA-256: 62801011e161b84a0bf3806e5cfa60df53fb622ef711f55ade4483bd32608666
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=percentage+questions+ks3+worksheets PDF link annotation
    • http://www.motionmantra.com/userfiles/files/wijudezuzavazaxa.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f9933da6ee4---70101787633.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/bemepuwibumakuguvofot.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac06a9cde---gulidafedotovebenizojog.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/3991778132.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4a7deace5678cdc2e751bc7029843e7d/37800688739.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfc369777---vawagokejigenilolumego.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/fenejujivuril.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/wajedofijosavaw.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/23864877000.pdfIn PDF document text
    • http://webursitet.org/Files/file/lixum.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/bovivobenap.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93281764b---99543097245.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/23585380885.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/5988332170.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/vewuwedokavepofeben.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jdb32gfmdrtihvld1um48d1a6f/39345017564.pdfIn PDF document text
    • http://pronobile.de/catalog/file/wonupopukezogoligavove.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/31675079761.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c1f8b778b571de345af8da8bfc7ccddb/95157433843.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609220771048a---79410593769.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987f2516310---famediwopezutakegepubid.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1037fe1db668e5b39bad969d84999238/binaleniputubagomek.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/21946654766.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_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 11060 bytes
SHA-256: 2f050fe565e6e5cb002a52b875f0dc9589d49fdc017fdfeb8b644470506c549c
font_01_sfnt_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 18736 bytes
SHA-256: 7c299a40eaeba67d158715696423118dc4224c20ddd53af403073e4d8a215fef
font_02_sfnt_off000121b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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