Malicious PDF — malware analysis report

Static analysis result for SHA-256 516f3ade5111c68d…

MALICIOUS

PDF

86.4 KB Created: 2021-07-08 05:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb35744ce298851f98bbdf313b7f5ad4 SHA-1: c523ff4ffd75f51ab7faa9d7ec3eca0c1e23c431 SHA-256: 516f3ade5111c68d9d961547735abd942f5c0b209f9386c25d87934e34502550
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a malicious PDF designed to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/fef100ca3c1fb5cea0877e24f29acf25/tulufupoweminodapufojaba.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/m91t8j05ipdfo140tvrko8aub2/67083009973.pdf
    • https://unosms.us/userfiles/file/83642612258.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/572be62fcea3093419126fee3b949d15/tibofatutuvepuf.pdf
    • http://exima.kr/userData/board/file/98053906719.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fntqls2a5n8rr4o53h50afb9n5/lepidavo.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/kedugi.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ellmc8ev31rs6i7t9ukjgv9t21/polafiz.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f3a1482df---koxofebuvoketebikov.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0756bd059---juwunedu.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6b15980aff3492cfa8963c49c87994cb/barifetogofamesavon.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/kelitarewexob.pdf
    • https://adasms.fr/userfiles/file/xuturuwanodak.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/s34eo4jamkkvh03hu13gnbcu0e/24125042955.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1d7787f4f---liwowusazose.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26dacbadaf---pixukefepofolowataxif.pdf
    • http://drivingschool-brno.eu/files/tiruziberejomirijefomesu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4503e0c2f---70237260398.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ba78331837b83eacc6050f57468b05f8/5578322913.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608285094786f---gagapen.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/dozelanafatexedofatixiket.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=never+forget+how+you+are
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4bf.bin
bdd66e783440048fa1eb42f41300e2c5f57c594117bc0a0ce1a5423354241737
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BF 16612 bytes
font_01_sfnt_off0000effa.bin
6525de30135e69c4bd8614dbc45dfee16711f63cab228d2b6d4b21b12b06f07b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 14168 bytes
font_02_sfnt_off00011a4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 16792 bytes
font_03_sfnt_off00013261.bin
6c34dc9443bfc5ec00d9faafca56b23d3b9a5ebfd075e12c8808a85d1b202ada
pdf-font-stream PDF embedded font (sfnt) at offset 0x13261 10424 bytes