Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4885dfc1eb74926…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 13:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e9acfd514f778b605d57536d4cf831f SHA-1: a7343bfb81e483b94d29f291cc8fdeafcaee4c91 SHA-256: f4885dfc1eb74926c0894f78e23072f6f9ef2ef35cbe276671abb73c2bb0f519
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of these links and the overall structure strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e903b712---pamowoperizopexosexumuxo.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/tovobukonavateresiref.pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/59078108276.pdf
    • https://angkagenap.com/contents//files/wazokipuz.pdf
    • http://hodori247.com/uploads/files/58152381177.pdf
    • http://dnt-mayak.ru/content/File/nozaxezotezakizevepu.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b7e9c0030---menimedobidonijekafibemoj.pdf
    • https://blokhol.com/upload/files/xufosad.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/cj6g08ao6e67k7v1q4rnn2u77n/xatefopazaveg.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef42cccb14---rowiwanubirerixularo.pdf
    • http://df-2.de/images/daten/file/69596271853.pdf
    • http://www.dawnrotaryclub.tw/UserFiles/files/wotanulivawunatevagavuwos.pdf
    • http://elcampoeco.org/FCKeditor/file/zidikerixazi.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5478270bd2---23478015792.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/65bfb4be56430d23bd79943dca4b8e9f/43462449951.pdf
    • http://vagtteam.dk/userfiles/Files/5072836953.pdf
    • http://antifftech.com/uploadfile/file///2021050301250589.pdf
    • http://ski-experience-japan.com/images/blog/file/30019417086.pdf
    • https://goldmenu.com/userfiles/file/44025848253.pdf
    • http://fszhenjia.com/upfolder/e/files/20210708101331.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ca8d5cc0---ketedijit.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30bd6dae9---29638510765.pdf
    • https://www.db-ynox.fr/ckfinder/userfiles/files/dikirogakubadikamadesuk.pdf
    • https://muahohangnhat.com/app/webroot/uploads/files/82824101472.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8om3uqothr9vo9np31o4ccl6oc/somilirapatokuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bankers+adda+current+affairs+july+2019+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_off0000be12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE12 16792 bytes
font_01_sfnt_off0000d624.bin
18ed8b8f335b9c181f0334b8c456e49edcaba5bd06d3b082a968e0f3381652b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 17692 bytes
font_02_sfnt_off000103c2.bin
bdf8df7d539f87920be299649f60994ee3df58a6f3e66c5a63594f151aa23c20
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 11444 bytes