Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc606513c62139fa…

MALICIOUS

PDF

89.7 KB Created: 2021-07-25 16:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a95a047b14eaf890338e273906cd4b1d SHA-1: feda7ef569a6060299fc00191b150ee4df70a17b SHA-256: fc606513c62139fa400e251bf7df804750869d03a81d627610d9ec74742c8bcb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious links widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://lu67.com/clients/50962/File/ninelirowatagixemefar.pdf In PDF document text
    • https://contabil-fiscal.ro/mm/file/ditojabegakodigunawarelo.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/gomabopugijapimapugu.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/83626170107.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21df537d1a---98277946136.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/592ea2355b76568546070c71e74dd352/kosowipol.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/lenutovajilukaxa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08c66f072---dirogowun.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/279569189.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdbc9859dc---vasutipugosi.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/49190815a6a160f39e1cfef22559f60f/61880974509.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ef436085---lozatakusuj.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/kavemodusukisudipulegesi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85be528ea---34098383364.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077207465c43---54860704850.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/eoma0a8nonasejirhfnt5ts76u/15290806073.pdfIn PDF document text
    • http://emaaravm.net/upload/files/4877897151.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094569e8d171---11546608649.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/lejexe.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m6go79hi84ku1h51j243l1nkj3/35399735906.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969cd213f4f---xakojesajozuxafefopu.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/wovozufiwafasinapexarut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=is+chicken+with+broccoli+healthyPDF 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_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 17276 bytes
SHA-256: ba719472197bdc1b9d1653d6bd8c5da270c9cbbade82a112896faaa0863c6cd7
font_01_sfnt_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 10712 bytes
SHA-256: a8e7914e152fb081cf77a1c0b09effcd829ec1ae2179021d46a85df13aa9b116
font_02_sfnt_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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