Malicious PDF — malware analysis report

Static analysis result for SHA-256 271513be3fe8eaa2…

MALICIOUS

PDF

115.8 KB Created: 2021-07-02 23:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4347518a0971a441a0d1560d4a7c880c SHA-1: 055bb01b392b5fe7b0d6e74cd179c33e6f2348b5 SHA-256: 271513be3fe8eaa26f4de5265e3286e09c10de2e1c0402b75eda7bd83dbe7f3b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the overall structure and URL analysis point towards a downloader or redirector for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zulassungsservice4you.de/bilder/file/41363751471.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab47decad77---31414628857.pdf
    • http://app8itebarandgrill.com/admin/images/file/jixapivawod.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7c4202d84---motopatadaminonete.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/40916a191593f792757e32494c4fb556/vemulixefogatutodufelejem.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c973d91962---96927463840.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/2763732228.pdf
    • https://avigailpekelman.com/sites/default/files/file/918456487.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160766c4138efb---firosixivu.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/907f6f7ba35eeae492ef30723d7cffe7/zopexurodabuvebugifusipok.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160989fad2d274---vekigumuvodogira.pdf
    • https://semagro-msw.ru/pics/images/file/967955573.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c407e5789---fokusinodopurafemu.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6faa91943---bupoxidekuzu.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/c2270fh77haa9mvm3lgipfmbg6/gaxulugomizunuto.pdf
    • https://mertlakustika.cz/images/pages/file/67387912610.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092995f3db79---34022599825.pdf
    • http://bmcnx.com/userfiles/file/dufodekixameganomula.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160711b1201cea---zakizisaweripipi.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7998278287---gamam.pdf
    • http://kaupa.cz/userfiles/file/xavugivaleziwoxu.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608192b66e068---poludijorumasutub.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095e28192a10---xogudogesupebuwobizuluxu.pdf
    • http://falerisztika.hu/tmp/95401405912.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7da14c785---demesugajanew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+concept+of+information+technology+8th+edition+by+tasleem+mustafa+pdf
    • 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
stream_002_off000145a3.bin
74cf65bf790844431c8768631e34fe1b7cdc2481508ce6467e069baa39eaad97		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x145A3 18296 bytes
font_01_sfnt_off00016315.bin
ae09062d62c434a5ffc506bad72e0028ebc882d0845a6742a45ed61a8e33c562		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16315 16324 bytes
font_02_sfnt_off00018d7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D7D 16792 bytes
font_03_sfnt_off0001a594.bin
adf9fdbd9e2a08939c8970dd2a33240781d7f4f51f5401e2385590d08f06140c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A594 11592 bytes

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