Malicious PDF — malware analysis report

Static analysis result for SHA-256 116e53f5544487fb…

MALICIOUS

PDF

91.8 KB Created: 2021-08-01 08:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c28ce2b90d3eab48c514dcd9ca81b0c SHA-1: c9c325a2e5664b4c7a0d1b729abf54c75e74b059 SHA-256: 116e53f5544487fb2aa477ecdea4235b8dee200a3a51f60ec45d37273d2f3948
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, a common tactic for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the document's structure and embedded URLs are sufficient evidence of its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://partnermind.cz/images/files/20122667190.pdf In PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/81556025766.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/51832751817.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/22731962626.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607167beb3a34---63305727122.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/72768734483.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/8c7997a1bbbed13168f9837955fced3f/85923485039.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083daf535ef1---pitotuwovozidudije.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/zepowidojasopezekebuvus.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/18565665425.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/20129427605.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/83126518776.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-25/20210625172057776164.pdfIn PDF document text
    • http://modern-pro.ru/files/file/kisesisuvobeb.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/85908864240.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e4173fbbb---jajag.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/410310790.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/55651672005.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5374bdcef---gefezezabirapepikifoxo.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/dmsj9cdgnskcjc5esljrqvqdas/2500372703.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/39259834853.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b513dbb381f---tavaxamigiwagunaje.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3e489e84b27d1c816b77d4256804fed9/99989542860.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f0480ac7f5c09c1882c83d08f69b9fcd/32806710699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=apk+five+nights+at+freddy%27s+4+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 19552 bytes
SHA-256: 4d838efa36c15cf2e1d79efaccf7cff3d81d5b70e6157250ec0c40284412cfb7
font_02_sfnt_off00012e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001466e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466E 11096 bytes
SHA-256: df57ce201fbcbf43f4d6611b4935ac70cfb1c3fe6349d05080d79ddf8902a51a

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