Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bf3369562cbfb8…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 02:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49a8be70786ed41bb193ad1560bf35c5 SHA-1: 5906ebdf6cf4b62ae1d6cfd79682d8fe7f54b5db SHA-256: 49bf3369562cbfb879df8a4b48c522855231873f408d3c5cf007ba54684ce7d6
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste content into a command-line interface, a common tactic for executing malicious commands. The presence of numerous links to compromised CMS uploads and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://27061010.com/uploads/files/202108270244219037.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d5ffd771c79e12df66fb155d96dffc99/42623487141.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e343c95c---jutososojabamazugajeduka.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/pujutilugapiro.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/fexub.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/66188138677.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/4830368b8fd359f2d4600106807dfef2/30795161828.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a7c3c36b1---nomezexokivaboxavovaze.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/monivodizojununijupodexof.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/fedabijobofexitixap.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/kokivasar.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9321dcbe6---71063191527.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08d7ab2f1e---31802567866.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/90666916987.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16129c6b85ab68---64105890834.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/12453057066.pdfIn PDF document text
    • https://agenziadiviaggiocagliari.it/file/5028848011.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/79422520569.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/5728299832.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/futenejasenorifon.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fdce732f---22541694648.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/vojebu.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/winazonawimaxazudomabezu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a03ae908791---vizuxiburodizax.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a6d0e754---32678311451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=biostar+manual+pdfPDF 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_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 17692 bytes
SHA-256: c16131db5384d4131968dbe4b404b29d0762440acfb0be56360e7047c9e3d6b7
font_02_sfnt_off0001381e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381E 10680 bytes
SHA-256: 687a786413068aa2a8c1001ba62568c3f142363129715643df7542f337e5fe0b

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