Malicious PDF — malware analysis report

Static analysis result for SHA-256 f155057957819ee4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-09 13:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89e44fbe5c166dcd672638fd41d55759 SHA-1: 88496c8f326b7a5d4bce11402bc40d89be076833 SHA-256: f155057957819ee4f43d4604a6cb14bbe2b30ea436971dbbc125bcebd1a5ce90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://garglob.ru/uplcv?utm_term=download+highly+compressed+ppsspp+games+under+10mb
    • https://onecre.com/images/content/files/73319527253.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/motobitusoras.pdf
    • http://itandem.net/ckfinder/userfiles/files/1652775418.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132a674d21cb---lagekijugibasukoz.pdf
    • http://askort.pl/Upload/file/47400661793.pdf
    • https://airbays.com/userfiles/file/42640320175.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161381a53c8097---dakadimefozela.pdf
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51804283115.pdf
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/muvumuzazividojaw.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613522bc22e3c---pozajaxeviwarepesosike.pdf
    • http://stefani.cz/fck/file/50664576471.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/bereto.pdf
    • https://ecoverservice.be/gallery/file/86188059522.pdf
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/negegekegamewafogiwo.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355dcb899be---37372823802.pdf
    • http://nextlab-semi.com/files/fckeditor/file/dozewozepep.pdf
    • https://ckmandarin.com/uploads/xedabolejovaxinesebajol.pdf
    • http://gammatradings.com/userfiles/file/65794557882.pdf
    • http://webminmax.com/userfiles/file/rudafikulibad.pdf
    • http://www.offshoreyachts.net/web_upload/editor/files/68305916742.pdf
    • http://leadingedgecorporate.com/user_images/file/13519406489.pdf
    • http://fosterfreezesantarosa.com/uploads/files/zodewezufiwemirosora.pdf
    • http://tavaszitura.eu/userfiles/files/pupufuvajuwofesexezijava.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b862.bin
7a4ea6499562a533dc1e4dae0ec85879a7a7033d92088517c70ee1846acc449a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB862 16984 bytes
font_01_sfnt_off0000e3fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 16792 bytes
font_02_sfnt_off0000fc13.bin
4fcd579e0f616f6f43a7b1f30a109c2c389a175b4efeca2c68c0f54f81389cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 11476 bytes

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