Malicious PDF — malware analysis report

Static analysis result for SHA-256 08aceaa7e647a1dc…

MALICIOUS

PDF

86.9 KB Created: 2021-07-14 05:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8958aa880fd3f818dcb66c1932185294 SHA-1: 07962b758e0f916a1b13844e5291a9eb28a59839 SHA-256: 08aceaa7e647a1dc5500a4b513e5f383ab9e521471f9242c1941f2b23a4c2e82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=commendation+and+committal PDF link annotation
    • https://pacpartner.net/images_client//imagesfile/gejaxiwunogo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cad147173f2---nurowawedekutusavobeniw.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/72391665586.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/bujatakadiraxonigorora.pdfIn PDF document text
    • http://atya.eu/files/file/7146129687.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/97390339975.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/371aa131f2d5336c36719ae2ed678439/kapewuxeda.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/jagubomumosagotolimino.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/99442847714.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d843b80867a3f84378ad700663515054/72256689771.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075549af0339---49013459107.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/42811201792.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/fanijugodufegupowetudep.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869dbad5618---bipivadozanegu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075179b5f61c---82161770153.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/isajapobo.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/penr6i007pufleb6k0pdujvn5l/17745716218.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1bca7a5ea---bofevajanosexi.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/43028146157.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/vaxet.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/536881025.pdfIn PDF document text
    • https://magerp.org/upload/files/zagevijezotavomodug.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/97734031294.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/84ea8503db4e7a8c2acb13170f006700/8287515281.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/6q1ekj92h09es3b412qgpoi80t/guxatozipemalepukivifo.pdfIn PDF document text
    • http://nkland.org/userfiles/files/4544616370.pdfIn PDF document text
    • 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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 16784 bytes
SHA-256: a014279d79b30503240d4c66a1103789cf2209f98e8e097165676aa40e518c3b
font_01_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 10292 bytes
SHA-256: 4346f6f9d4b15773bea081f2cc258b5b5a7b3a13fd7b382d5b41db697216a4ec
font_02_sfnt_off0001365f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1