Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb5923fce253783…

MALICIOUS

PDF

73.7 KB Created: 2021-07-05 03:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78408e1aaf45f33a724ba2c09e3aca83 SHA-1: 256561fba22c98b86f07b208d99f82556a384be2 SHA-256: 7cb5923fce253783a57dba89d7d3898479e57255b1c5c81a81cf32d56df6a967
156 Risk Score

Malware Insights

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

The sample is identified 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 sites and other disposable hosting, suggesting an attempt to distribute phishing content or further malware. The PDF structure itself does not contain executable content but serves as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ff5e9908d75a75c849ce97673f135d57/87421920286.pdf
    • https://afayl.com/userfiles/file/milujigi.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/l9td43a9niege7l9rc02058gen/kozamufute.pdf
    • http://www.520amis.com/upload/files/jujuwuduk.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1140bdca---49566480435.pdf
    • https://silverwayshipping.com/userfiles/file/51664966794.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0nbqsjnqf041arphr5229mgsj3/malogaruzuxirogodome.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/40032851637.pdf
    • http://daydala.com/userfiles/file/87590993279.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/194d63cdeed521e898119fa9bb77f121/21587910618.pdf
    • https://ladangmimpi.com/contents//files/zezowifodinugokuxobagima.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075801125835---lopifaxegamojum.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607389e9030d7---sevadajakaxesefageb.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0db499652---65012131694.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/87d4b2f41add6a8fbf51862338a6ba41/78504991064.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/d0f8e9de1aab3cff0019c0472f3af774/35454559087.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae88f417ea0---79715996572.pdf
    • http://cs-golfclub.com/ckupload/files/povokumiwonetod.pdf
    • http://bpsstudio.hu/uploads/33871713030.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f0b20a25---tufukebosobexuv.pdf
    • http://ahkjt.com/upfile/file/61180940522.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc4a2a7bfa---newupuki.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f7b510f2---warikuvapimo.pdf
    • http://mishelik.ru/userfiles/file/kusozegotudosowepinexu.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160d670264f856---luvukezapazi.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160778c3886ff5---sikutidudesatoduliguveb.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=special+characters+symbols+list+in+keyboard
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb2a.bin
62f900546cd6326d9a24f0cf666bd347f50f02aa93e480d0337be28a74e675fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2A 11200 bytes
font_01_sfnt_off0000d4f5.bin
b389683f38a91534cd0ec3be440caa05150eefd676a5d92cdcb63858b6b799d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 16968 bytes
font_02_sfnt_off00010136.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 16792 bytes