Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c5c471d39f6e67…

MALICIOUS

PDF

75.2 KB Created: 2021-08-10 03:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a16997610a883ba243909df4e19aed9c SHA-1: 545e6e90dbd219fc263e018b2ae9fa1ca05f96ac SHA-256: 82c5c471d39f6e67e6f1539522c2719837d4e16498e9f5b4a3aefe813d7e59fb
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple links on potentially compromised CMS uploads suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://alakharia.com/public_html/userfiles/file/29159457040.pdf In PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vbs2139h7jomfhmplig5bdq07m/mixesasupik.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/60644630219.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/8347528850.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/b272687bfef4a8935390cf3014fd09be/50602278361.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f138c8ddcf1---20464043012.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9ec6a41708eac794e7e4bde0f89aacf9/76498163959.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e0fa8f0c---vomajuvoraxukisex.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-14/images/files/losuzivewizasesijupode.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/75794507963.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zaxizamenugebufanat.pdfIn PDF document text
    • http://wajl.net/img/file/202172612110.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/maramenigekedusiveroz.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/vudalafibawojobigedagova.pdfIn PDF document text
    • http://land89.com/ckupload/files/wodovugaw.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///48490449213.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/dikerikopifisixaxijar.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/belivod.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5349be69d---72586743693.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/14863384490.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/vufifonaduwevifomerin.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d4ae1607a---58316150173.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a2d189a85---45298572789.pdfIn PDF document text
    • http://hongdacable.com/d/files/bimosuwatepajufegezitor.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94927557ea---sujusunozapaxinunax.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/fofifazif.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/milv4dp5c5m59n8kap5ev6v5k8/45613039425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=a+line+skirt+pattern+free+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_off0000c58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58D 10444 bytes
SHA-256: ef04993526ce0dac44778c1fd9bce4b580d819c0343262a9517eadaf70e80d17
font_01_sfnt_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 16016 bytes
SHA-256: 01677ffd943d4b36c32df08b406640731694851816a5100ccd41503111a60f26
font_02_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1