Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fa617404c00663…

MALICIOUS

PDF

95.9 KB Created: 2021-07-01 14:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbdc0c47bbea7317693924f83263d38e SHA-1: 6c311276777e73a2d3ff764e0480227e77d5d0b3 SHA-256: 56fa617404c006630c729bc5e63eef3dd2b0895e1d40b2e3157dd76e6e78bd1d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. The presence of multiple external URIs and link farm indicators suggests the primary purpose is to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/t1tndcb3m7kqnj76suigraqjdp/sanepebaviwug.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160be5d0d4d94c---74713814436.pdf
    • http://eko-inwest.eu/upload/file/64060664562.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/be771e6a7e0431127a76113b4583e781/88909479174.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096066cf3f6e---jivame.pdf
    • https://partnyor.az/userfiles/file/xizirug.pdf
    • http://granitemountainranch.net/userimages/lalepigoxasebelabemu.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073013a272c1---59579124106.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f18714297ad42c8422322013a983a5db/mulujipadukamipugeromuko.pdf
    • http://jjinline.org/file_upload/file/34656693564.pdf
    • http://ideas4mypool.com/userfiles/file/69635308088.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086999e23860---mumivosone.pdf
    • https://zemiigori.com/uploads/file/10469500953.pdf
    • https://kaptenhoki.info/contents//files/93081533749.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f832aed923---nakizerawa.pdf
    • https://acgroupenterprise.com/userfiles/file/vixawabiwiruxegawunumige.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/66bee88bcb10c1f91176b6f523f1c3e4/golifur.pdf
    • http://scheiden-maassluis.nl/uploads//file/wolazuwakoxu.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e14518a6b---bufutigabowotab.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/52892721233.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b535910592---sitekugulekag.pdf
    • https://limmaginebistrot.com/file/93403946353.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/v7v8m18lrvtgb9t4pudpqu0via/37779713322.pdf
    • http://kursadowicz.pl/Upload/file/22896175492.pdf
    • http://vds-construct.pl/userfiles/file/46354488328.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cf786150f---69672741108.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=household+items+that+begin+with+q
    • 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_off00011177.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 16792 bytes
font_01_sfnt_off0001298e.bin
6ae921466d41ac5a728066d4aaed0f11315835acd4237f96c3e433a4fc73423e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 11056 bytes
font_02_sfnt_off00014297.bin
b8c6e774f84d2680a56c3803743ecb372cb16f12d86377be0917c81150f323b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14297 18244 bytes