Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a194c640484452d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 01:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f4dae016567be860d1dd31a9dd77310 SHA-1: dae49981b8c5f54fdab8226560dffe5140f69982 SHA-256: 7a194c640484452d1ee510818aafbb18248ff9b5912149e9979217eb2a0cb111
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload storage, suggesting an attempt to host malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cichanski.com/Upload/file/wobudisiwatob.pdf In PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/34898739968.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/vezeranekigenazo.pdfIn PDF document text
    • http://datcat.vn/2018/file/zasasagapebusenata.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/67781436049.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631140566HYba.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/rozapejogovufupagifoge.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/susemagelenadagoluluveka.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/9890733279.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/wotutunutigogubeg.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/687e38d52757f24ba534a7e47946f6b3/14921358494.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/45778695273.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/jufebovarofititunileka.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ec0ff22c5---50543719719.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7dbf87c9e---geberamevikitosuridi.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fepuxewezezoseloxilu.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/terilodavezivo.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/69817768686.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/12370076728.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3fac3c65eef903a543510fdcf8a01051/joromasomewoka.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/36211968719.pdfIn PDF document text
    • https://rjpexport.com/files/75847201590.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/tomedonikopusudobupakali.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/lopeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=subway+simulator+3d+passenger+mod+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_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 21564 bytes
SHA-256: 60e39c107ca8530dadbf5fa405a513ec01d1702fd613619c191731572dd43de7
font_01_sfnt_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 11420 bytes
SHA-256: 90a93b061af63dbfd1d611d8a589438e3b7d8a5b806d691174e07227e9f91b65
font_02_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1