Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8101e8bd0ae329f…

MALICIOUS

PDF

140.8 KB Created: 2021-08-07 15:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d6b7949c4e3179734276f171e3652a90 SHA-1: 5b3e98a2e73101a110cb3d018af9584f49965176 SHA-256: c8101e8bd0ae329f792ab91f42c2e8e94284a7f75e3e10bf8ec2304ee977b0a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9727

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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4438862836b7d371450f508b0f87e9fa/92141592047.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddedb42942---ratinelitupawawumuni.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ed9e0861---nesijovow.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/rizizelemij.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a15af3463b5---26487181596.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/divamivufuxipijexejepajos.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/numewazedobibizomof.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/zifubeda.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f024aaaad0---61381439525.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd696bdeb8---sedilenapakosapasajuguwu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb0a3a8cf---ninuvatexuka.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/dou7i2f5puitin6h1fdl71hvcv/netopawojorik.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9ac65f8d497c3126ce7718d47610d903/lodimomofejokojigatelogi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa272be97c0---sajig.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160719ff079348---pevenonapan.pdfIn PDF document text
    • http://greenbrier101.com/userimages/gokuxowigexaxodakal.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9542471778---54179570725.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/95754307263.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/36874010127.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/povuwa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/sagabijotarazug.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62d6d22ea---92046401336.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/perage.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2a23844e7b7112c32f8c99121df97ec7/57658406171.pdfIn PDF document text
    • http://pneusmarene.it/images/file/81430204386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=2000+honda+shadow+750+owners+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DDA 10840 bytes
SHA-256: 326f23cec1f494a35790d4fb698d49413cdc70793a7234ebc8d0f65ff9f0242f
font_01_sfnt_off0001b6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6D4 20836 bytes
SHA-256: 3b022dc3d55e0283d8090afa0dffba4b22c25cf643515586ed1c97b770831b47
font_02_sfnt_off0001ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC07 8804 bytes
SHA-256: d3dd1c7f502d3b33862d2fc5eadab2ae063e83a2a8192a6659bced83dbe80364
font_03_sfnt_off000209b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1