Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b00053c9ab3aed6…

MALICIOUS

PDF

68.4 KB Created: 2021-09-19 11:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 045b48e1581edaa166bbd973da7d132f SHA-1: 8c35390260220a3bace4f4e7ad078f8c7802a66e SHA-256: 1b00053c9ab3aed682831e291dca03f4155d834007c72279cea06649fe072b11
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, strongly suggests a phishing or redirection attack. The document body, though heavily obfuscated, does not contain readable content to further clarify its intent beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://caycanhtuyhien.com/uploads/image/files/fisegasufamezuwenupemal.pdf In PDF document text
    • https://cape-electronics.com/media/file/dorinawe.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/407780220.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/beporapaxapedon.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161351e8551e59---nurotu.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/puvivonoras.pdfIn PDF document text
    • https://botroul.be/uploads/26748430040.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bdcca3cc2---11632731639.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/wamonexuwojenigezujov.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2f23fcb7---vatomivekikodimavusasate.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/44107590703.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/pilodogitirenutewaxuwi.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/nonumobaku.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/70030713055.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/87006485262.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/29501142706.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/7219388066.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/4738447801.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/pekugunewekopovom.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/puwesupeteged.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/9927468262.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/92576639112.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/lawumobagadejebifiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=online+android+emulator+downloadPDF 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_off0000affc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFC 10452 bytes
SHA-256: c72ffce8878c180961adc6ff961ac926bb82c95d7a3fb1cbe3cb5acc53c25abe
font_01_sfnt_off0000c7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B8 14608 bytes
SHA-256: 9b3e7883191501999d782fdcbd9f2adfd7c0e2bfbfdc79dc75661b1af2977b96
font_02_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1