Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c06fdffd00b1f8…

MALICIOUS

PDF

76.0 KB Created: 2021-09-03 17:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a56a9522c12b4773f28259acf0013ce8 SHA-1: f363918198a94c27ac80a20ccd999fd8fd576b02 SHA-256: 82c06fdffd00b1f8eb9003a02b6ef2e57eb0bf28263e5e917e2fe5ee5fcb2dc0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous links, including those with UTM parameters, suggests an attempt to obscure the final destination and potentially phish for credentials or distribute further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4624

Heuristics 5

  • 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
  • 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://marblobaths.ph/app/webroot/img/files/88522931436.pdf In PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087453144c42---pomosapozipakinoto.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/35369207015.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/bugizofanitazilixoderipiw.pdfIn PDF document text
    • http://normel.org/files/upload/file/93840816181.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae80fcdf5fa---vomevesopozulufubola.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9ab194a995339fe01bcad8787d4fdde6/1733748904.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085102f05417---56580768347.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/19031088160.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0g6i82e1kam87ikiiolkapf2au/28734490884.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/xeberawirenira.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/47988785180.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/sozogezap.pdfIn PDF document text
    • http://sbkf.org/files/files/99635045284.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/243a3845497ffc2086db324826e660f7.pdfIn PDF document text
    • https://t2sc.me/userfiles/61672229041.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5q7j24p2cqn3nv396u1hsa92g9/jajelukewisinof.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/zefekeluzenala.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/mijevubix.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/67708934751.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/xugibidutimudesobulewafeg.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/foven.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/47963983439.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/boberunig.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/27558630459.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/90600309417.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e03d8dd57f---pivagomepupefom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=olympus+om-d+e-m5+mark+ii+instruction+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 20168 bytes
SHA-256: 6ba5791227e4650430c6fd01a09d392052b7fbb4a83ab6d98ef8ab272872c7f6
font_01_sfnt_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 11172 bytes
SHA-256: 5bae2287e4ee23c7d9f3b03c96f3ff87e1092997b837144849de0c1bd5e45fa4