Malicious PDF — malware analysis report

Static analysis result for SHA-256 73753dda5022ff0f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 03:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa6aaef696d7d691dcb58e32dfe0ad73 SHA-1: 4bab5c1b1b09de2f5c1b142191772765bb117b38 SHA-256: 73753dda5022ff0f4fba1341d5ca392b7c7e4c50cbdda2ade24d3144e3f2631b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports a phishing or malware distribution attack pattern. No scripts were extracted, but the overall structure and URL findings strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=sniper+warrior+pvp+mod+apk PDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/413d7698805b910b22edd564a3ecdf6a/97645187254.pdfIn PDF document text
    • https://nistd.in/userfiles/file/vowolituvumakili.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/51321107813.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/wufotezu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/2uj81bholld7a6tcca2cdmqmeg/tadozabejolexafe.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139dcb7c43fd---51888603665.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/luxowibajig.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/rasevifejenuximakidi.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/12374960411.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/daduguvofosagem.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/74575256379.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210910080206.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/nobewonurafeg.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/xonotezebanun.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/24365927254.pdfIn PDF document text
    • https://service-panev.com/userfiles/vadavafakik.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/xinimi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161467b68151cb---lixanikeku.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/62638659794.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/4959668313.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/wutuwaralufu.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/41988904168.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/kabunixilexetosuxejed.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/91616892131.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/72616433477.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/27973203756.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_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 19428 bytes
SHA-256: 8451a8aaa97d008086fa08a7d6063a0a280c716fefa751868086bb3ec90856b2
font_01_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 10560 bytes
SHA-256: 2816c2b541f31c2078c88b80f51d6ccb6fbd70faf2145fc5cb3c0d98a67714e1

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