Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a034caa45c7919f…

MALICIOUS

PDF

159.9 KB Created: 2021-06-29 02:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb8942e4b81b11b045e9237389d8e8fb SHA-1: dab0f9b5abe4ded4cfeab7c79ba0fe7f62c9c7c2 SHA-256: 1a034caa45c7919f1c0c1f5afb13b462b9f40d8d99d6916219b6f605bb85bf68
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072635401934---73820954214.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160acf90677283---19123756175.pdf
    • http://tecsun-moscow.ru/docs/file/ketometaz.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160865bf6ba188---32916113168.pdf
    • http://crmloccitanecr.com/campannas/file/dudozukosuvavizo.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea531ea6b---99201952914.pdf
    • http://bajajsports.com/userfiles/file/jiluvajagofasale.pdf
    • http://sequoia59.com/clients/867919/File/56357930586.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083aac289984---radatodugikoraten.pdf
    • http://apcmagon.com/userfiles/xidewijafaposab.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33e9328d9---pibopabujupufawivexizuwo.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815fe84ba01---97021454654.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0198cebad8---bazobukewuzuvesixikazobof.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b640f095938---sukepudokez.pdf
    • http://poltinik.ru/userfiles/file/felegabako.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847c43b8dfe---27443697527.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/xinixuzisobujurabawe.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9ed0850d---56205190418.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d28c8f25---65769093698.pdf
    • http://bearings-home.com/userfiles/file/pofigibamudulofijetix.pdf
    • http://accronline.com/userfiles/file/bogatonorap.pdf
    • http://chinoboxingclub.com/clients/36032/File/77891250341.pdf
    • https://foundryindia.org/userfiles/file/mezanibogujananefa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+comedy+of+errors+by+william+shakespeare+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000214c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x214C7 16792 bytes
font_01_sfnt_off00022cd9.bin
e7c6d4569b0c7271bd2e242cdba8c48b5e73a7f3c12c35613c639f109c8e36df
pdf-font-stream PDF embedded font (sfnt) at offset 0x22CD9 16668 bytes
font_02_sfnt_off00025815.bin
c37a0751ddffb820b658ac4e989a0222b1d9f6cd410ff0574a0d376b833ee2d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x25815 11080 bytes