Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b091d16cf47cb9…

MALICIOUS

PDF

86.1 KB Created: 2021-07-30 05:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 199220c83b5a00b6259970fc5b1c1cf5 SHA-1: c1310520884a854fdbaa7ca73fa6854ea33d0c28 SHA-256: a5b091d16cf47cb9860419ef6a6704aafcb66e26c05fbda0c574400f1224f241
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. ClamAV and ML classifiers strongly indicate malicious content, likely a trojan or phishing lure. No scripts were extracted, but the structure and URL patterns suggest the PDF's primary function is to lead users to external malicious sites.

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 http://cameradungphat.com/uploads/files/57982131517.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/077fd66d196ebc268b64773efc394ad3/15670376018.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/gorasifasufale.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/74141601341.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jukexugav.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870166c9644---jozirefozubebolixijo.pdfIn PDF document text
    • https://jobtiara.com/files/files/88097066635.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/doxuforunugazakek.pdfIn PDF document text
    • https://mytopics.it/uploads/file/dixesarelakidinimuwud.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vcicgdb0j50reoe73tvsei4sc6/80372866991.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9104375578.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b3e3fca9c261799ff3efd3d6e3d7c70e/15372523083.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/31003024094.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160cadb9bdd675---zifalilemeb.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qkhdfsi6i2j6peeatpa6dc8jf6/jasajotejijudotasegetafi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a2857a4e---rexusijefoz.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/lupizel.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/nibewupinenanedibil.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/13882ea035ec57deca2352eccef81180/livujuzu.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/totirositi.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/56870698696.pdfIn PDF document text
    • https://puppometalli.eu/file/46415673968.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eecf09458---12836032777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+misplaced+modifier+and+give+examplesPDF 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_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 16816 bytes
SHA-256: 57edbbc8739c78dda3dc6a2cd311a75c4bbaf00e0fbca2c9c06ff9b0e65356b6
font_01_sfnt_off0001182a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182A 11228 bytes
SHA-256: 25ee2e3736e2542c85e0ba90a1b1e6ec64a850604cdb3f5354a7d0e7a6925b3c
font_02_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.