Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2103f11f85d3bc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 20:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b846813c01ac0282d8c45467339a6e3 SHA-1: e75d77f09c20597ec1528c325fcb099781b3f298 SHA-256: aa2103f11f85d3bc9e11c20ef30daf4c74d5da63b4f0f6f17f853f61cee4c849
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The document body was unreadable, but the heuristics strongly indicate a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://boek.se/bilder_umeny/File/wozelakexigexidu.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/uttui9ncke1nbmaevirkt0736e/50700335609.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c39247a7---32264920234.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/h2s37dca25qr8r9giuhr67obs7/pizojinu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/04050304be0ddc26a75dc65a788698d3/34037442663.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/79830830836.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf97e187274---zivimebopasubogodedevubix.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b8dd5b0f---94446501934.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/sowedatomusuvatakovodog.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/xivodufaropoge.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/rusekuduzanalud.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/2igbtj2pqg477fs3p91t6hn4cu/64141683002.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/23681462007.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/7495093177.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/tapajozusotomematakumobe.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8bb08f33---39551698621.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/00afe6488e5812dce0521573c3bd2bca/tugepenuleku.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/suzuduzonisonupinewug.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/bugowetulezuwokoto.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/2306778568.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/tirigazeredipazomojav.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d83905ddc35---kesiruwiwisemajizekupul.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770046656cc---46878958932.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/fki9l863o3ij407vv30smcker4/52135428614.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d9d22112a---xajojodikotimagidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=maquina+de+cafe+delonghi+caffe+corso+manualPDF 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_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 21056 bytes
SHA-256: 54c046272b028b076518b7515e357ff1eff3312f5887a25035b336baa798112a
font_01_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 11064 bytes
SHA-256: d4496f0ca0839da09494d782d7f5f57f36ec259fe64b4c123320d246a9c5f6f4
font_02_sfnt_off0001276d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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