Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc0ea355d09f6d5…

MALICIOUS

PDF

87.6 KB Created: 2021-06-25 15:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9427b70039ae5e16cba52c396a381fe8 SHA-1: 27c53a57ce90b4305468d81db83cd3a72f2e18fe SHA-256: acc0ea355d09f6d5989d7e8e4bc461b71ff45f096872c5a6575149522b2dc499
116 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs hosted on various domains, many of which appear to be compromised WordPress sites. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, aiming to trick users into visiting these links. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://residenciasanamaro.es/userfiles/files/73000251812.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/537d8f04f0bd0c05115009e880765429/44079566194.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/361636cd60733ba87064d4adc7503269/87265984593.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89b35311d---laner.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/71bbec75392f3d5b8f5d012401bfc11c/mukomonixatutolilevek.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qr2k8sius0rnmid9k99j9jh0ss/ganoxibikurubuzafuzep.pdf
    • http://msamericapageant.com/clients/873634/File/96080149690.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231199a11a---sobetewu.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0g5fvk9mnp476cr8jf1epful6q/rijowixotoxi.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885b7c1b9db---xakosuvoko.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1bb2e61d---dilexedozeberinaxavo.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/supozapurapewo.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e63f474108a586e6688b14404b60d6d3/rotusunavuriwe.pdf
    • https://seeandhearbetter.ie/img/shop//contents/58528550685.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=murder+mystery+escape+game
    • 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_off0000d8fc.bin
49af513be5584b63ffb3764bee6623887ad08f97da0f4f962e57d3c96009cc3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 16368 bytes
font_01_sfnt_off0000ef49.bin
b69b34a7c8b9cf884216c7c667e0b98743fcd4da48e5cc0fa7b79275a3870973		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 10700 bytes
font_02_sfnt_off000107c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 16792 bytes
font_03_sfnt_off00011fd2.bin
4b6047de21d436c371adca745ad07b98fd3ebf8f17c7b4fdd0d55cea18880303		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 18196 bytes

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