Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11a540b72dc0507…

MALICIOUS

PDF

84.8 KB Created: 2021-07-17 00:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0fde74a77c780eef0249cb00a32999b SHA-1: 807060c0174e00d98ee159a9a68aff6bdad00867 SHA-256: c11a540b72dc05071a5ef460511713783a0465ca6f6ef2c13845e5d3e539b378
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing campaign. While no scripts were extracted, the presence of embedded URLs and the callback lure heuristic indicate an attempt to deceive the user into interacting with malicious links or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f382fefd89---4165191000.pdf
    • http://brukbet.com/user_images/file/xisujafiduj.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/405252dff2882c957463d997bd6674dc/83383558001.pdf
    • http://bestbuyfromindia.com/userfiles/file/bajomosutokixisi.pdf
    • https://eastmanllc.com/ckfinder/userfiles/files/90123710537.pdf
    • https://topupdana.com/contents//files/vozakutoraxaj.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/6990177148.pdf
    • http://crmrealty360degree.in/userfiles/file/55058786208.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf43b5f90---56029302345.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e14ba9176---dogononu.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d39761bc---3343842661.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/51126830579.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/kadaxabosagujele.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b29191b605b---3740305109.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8116745c0---60446530549.pdf
    • http://capitaloffice.pl/fotki/file/totemuborazol.pdf
    • https://art-gallery.mn/uploads/files/zimunuzimofi.pdf
    • http://lavalnerina.it/userfiles/file/bodawijakamubaxotosovuvu.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210713042242.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9c1fc6ff1b46db3c2646a22ca73b13b7/lipizo.pdf
    • http://w-f-l.de/user_img/file/42582462061.pdf
    • http://xycrusher.com/d/files/78674441396.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0a4fd202cff5be19f5703b9f1975e5f2/51172575379.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c707c1401c56084b1171c70c230a7a7c/7298063962.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27504cce5---5100057678.pdf
    • http://ciaooo.ru/uploades/userfiles/file/dopanix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=feeling+tasteless+and+smell+less
    • 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_off0000eb21.bin
4e422bc7a7db7e28215fe5ca83a8c0c9e5cd0bdf60759824d7906b1bff04ee80
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 16736 bytes
font_01_sfnt_off000116b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 16792 bytes
font_02_sfnt_off00012ed0.bin
67d071ce3a941752c885af4a69378449152059a8b08b61b0346ddd5261287e5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 10348 bytes