Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c0931d53dff3cc…

MALICIOUS

PDF

101.4 KB Created: 2021-06-29 17:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc8ad30a98fc917d2aaef9c741f9362e SHA-1: dbe4538a40978e7622a9f614b8cdf673ccc80ef0 SHA-256: 53c0931d53dff3ccd25afc4581dd7c55adb64298def77d07b64c8e56a4c15dd9
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document body and heuristics indicate this PDF is a lure for an advance-fee scam, likely related to fake invoices or prizes. It contains numerous links to external PDFs hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lure point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/bc83d655f3f31ecbb0c7feaaf52ab1fb/72120904751.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/2fc924397e24b739ff99f8c2584e6a5f/zebimesu.pdf
    • https://etadelloro.it/images/file/nugetivop.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1f42a4ae322fb54eab03eb7febbdfd3/vowuzadedirutazoravilaw.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ekv77at561iovfv6cjeimtb953/pixute.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd2de08af---zemilu.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609071fb8a406---fejajaxavem.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d59f023f91---85054839873.pdf
    • http://zulassung4you.de/bilder/file/78276125616.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92dd0cdae---nevimilozugajolovowuwawa.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/20100bd22cd0ab6bb7b10ebd045fcd9f/87956288675.pdf
    • http://aliceinformaticasrl.com/user/pages/95231834002.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c03c3f60614---telakusematetok.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4ef7a90f---69181704535.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071161700210---pizalinererafumexivon.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/aqnso437jq7pph7j1u898g0okr/jikot.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/16dc1a0645567c114948dc328e0354db/vokimovedatux.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6a8d110e---bubogexujukega.pdf
    • http://charivne.info/images/file/pakebojenuvarobusix.pdf
    • http://esoftland.com/userfiles/file/13518467089.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/81675002704.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46daa538ff---91040079906.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ca1b11db---rojuwute.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pod+meaning+bank
    • 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_off00012f82.bin
35d3a8e7a0a3e597b22464842a2c11a6c9cdcb51c7361cd17b1a4e5124486c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 10412 bytes
font_01_sfnt_off000146d1.bin
df38d7db800a7225c6372dbefab2d5a85bc65d750634602c3eed2d3a32622e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146D1 16288 bytes
font_02_sfnt_off000170d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170D4 16792 bytes

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