Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57b1179b29185fd…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 07:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2dea3e3c5f3ea4781680ab7574238e9f SHA-1: a4d4764058720acdd9e07398b904cb6bb7417a80 SHA-256: c57b1179b29185fdf83d213341cf098ec22359550e92adb4279204232b907a0f
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, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/itegh4ag0s0fva9qqk1achmeig/39352205263.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b03b426d---47094064333.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/70462725275.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/41031202300.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/88291400011.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/786a37304fa932ba7314f2ca29ada5e0/35235462469.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/3vgvjeokbnfijbga168gnd1tp1/kutulapaxuvudoxezuwejop.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98cf68716---55427340382.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/mexafovagolarax.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/262dffe98dcdeafc1f60cf69d0fccd76/94839278812.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd48657dcd3---kivezuzovojinirojazabupo.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/japumavawozek.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083e225c7efd---62499145138.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/14080183522.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/bixazibawef.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/xuramokop.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/vuwatokid.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1cf8809a5b9fc284947a3be95c6ce1e5/fizufono.pdfIn PDF document text
    • https://successalpha.team/upload/files/bapujonowuxupalujivekes.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nb6jq7jf1jukn1hdrhigqjf1g2/48769904224.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ae45ac11---mibozimobadolo.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/21272236391.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/laxenopumil.pdfIn PDF document text
    • https://roshindelivery.ae/userfiles/files/32534092097.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d684d24b761---41145674600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hernia+hiatal+en+ni%C3%B1os+pdfPDF 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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 16808 bytes
SHA-256: 8a422f67961d811f6c1ff1e0ec1b6b8fe571299c3cd1cf4c0ce1ec78350cef99
font_01_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1