Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c36bbf150a3710d…

MALICIOUS

PDF

128.7 KB Created: 2021-07-24 10:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a8871e749eaca6b22202a112553da48 SHA-1: 532c20d56e25349a28304e2c6c1ffa5a4f13a2d8 SHA-256: 2c36bbf150a3710dd5749c8928b319505eab365aa42b52ed7a63cae5e051e9c7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806c5a8dbc8---zozuma.pdf In PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/qhem5n0opkqodb8st44d4fs31s/jisejofovavafuribuj.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/028f894f191b10f2854913d97de05437/91676198096.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/f4a7292c52a94eb6167fc795de6c1078/mosejolelaxisaje.pdfIn PDF document text
    • http://fittbike.hu/files/file/81728761822.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a794315ee32---paxufaneniwurububalalujo.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/56877919183.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa0f4c09f---93089578985.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/futilogewesal.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce7f66483e---36351742092.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c295133fe---53299588428.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae936f2d101---likubajekeluzipo.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/pixafefaruwi.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/63907404640.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/94385936025.pdfIn PDF document text
    • http://1careglobal.com/upload/files/51152695649.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/36c4b4e5ba3dd2ef1279f9b2b050ce2e/rivozimimuwed.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bb3809245---3211509771.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cc000e801---29769697377.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/konunuxerogapibelekap.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609453316fd67---68517157736.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/lofavupupugo.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/57520677413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=manual+de+instrucciones+maquina+de+coser+singer+8280PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19033 18824 bytes
SHA-256: 60e96a281b43eb681f3e5b3026b3461e31dd018bdf7982a061bcb9a16d7e455c
font_01_sfnt_off0001bff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D80D 11400 bytes
SHA-256: 9eecfe6efe3174515468ef3a2977c4ed6e70a57d1d1ad00dd30d42745e7a32cf

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