Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd39a1dde1e09dc…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 04:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23c8a8fee53975d3511c777dfb353d01 SHA-1: 476a1c99ef6fb8abdde9499cc4da7ba5a5b87232 SHA-256: 6fd39a1dde1e09dc9e223d8b834335bce53e89347ffd052f04fc5cd6edbab1cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites. This structure is indicative of a phishing or malware distribution campaign, likely intended to lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f02485f2---sugeji.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e3b42fd54e5334b72b81bbd2999d8bcc/kebemabezafowebeguje.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/2128882606.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41470485343.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/89264607876.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070695363882---zewon.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/7cd7f7c5fa47e9de64fce9214bcfd271/bamonowiselawegakigosu.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/1303824992.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/futunalameboxori.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/fotuvapumor.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fag0jm69mdeasro2cs37gm7vj1/kutaretinixonuvuxoruzow.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/73780257044.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/20711900671.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/jumibugemolugapu.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/15005514042.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/92941925946.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608665f65e4dc---jeniwore.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8d0fef78c3b801bb07f032897191f75d/dofemelizawalu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b908fc4e---nerizid.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/82678422768.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6720b53c8a4ed033fd71762bab502f56/33888944541.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083acbf4e1f9---vokokixuturugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stove+top+baked+beans+vegetarianPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 10892 bytes
SHA-256: 705f42e5fa58a9fb4eba9a1aaed705042f375913c91dca4e4f380736adf5f888
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 18516 bytes
SHA-256: 0ba60dbc3cd81699d6d7f1d2107e2588355bfa90b6c5dba779018be2ddaada6b

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