Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd63f294c85b2981…

MALICIOUS

PDF

87.4 KB Created: 2021-07-14 07:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bac76483512f71f90fe8c0644bbd9d5e SHA-1: 04aeeaa95fc153bfad193b0aff4c2eae5f41ab9c SHA-256: cd63f294c85b29812e3919bc2560bd25b79dd1d59e7729666b98d5020a8d3f9f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier strongly indicated maliciousness. The primary purpose appears to be acting as a link farm, directing users to potentially malicious or phishing content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://rozgarnetwork.com/ckfinder/userfiles/files/9438615523.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a33aeff76---86834010647.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae0a5d0ab---64926477754.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a36212e0d0a---dakegomuxemitowunab.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/31888185861.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e196bc4240---fovutejufogujadigevegude.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/91340997391.pdfIn PDF document text
    • http://24cvety.ru/upload/files/56399808928.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b6c881d0a9c8979b81b6106ddd96dbd6/86455519379.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/13764866207.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/50362330371.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c11cd5fd2---35304855488.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/48425839935.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8980dcf0c543993e046958fc90c2dc71/xoxofa.pdfIn PDF document text
    • http://builderall.info/userfiles/file/47716436181.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/33fa395bd1b7d0894fda23951e00b5d4/75796055978.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/lp7c4v1dc52d4imoersrvrkjcj/75808623718.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608777b519c7b---baxeruxotono.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078c37716586---zuvodudogubozetarupejuna.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210703_C74889BADE778576.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qd3ljmtqlem7t8bsit8vrdt24l/dawebironedijo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a311c515d0d---89975339923.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607127d471852---podozajunekafonobefozaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+clear+hotmail+inboxPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd9a54db1---79406902579.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_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 16872 bytes
SHA-256: b3b7768ac49e4bba8236f6ec3ee14d310c49f0fdd6bdd28d07311703f4234d1d
font_01_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 10644 bytes
SHA-256: 247340e703f842d035e98d3cde2468305d485ebcdad70c396af0b1be8e79186c

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