Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba382eac1d5b2762…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 04:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fbafb1bb7fef7a8f432cfad4617df96c SHA-1: 868bb058a46373200dfd67e06bdb13230efc1d7a SHA-256: ba382eac1d5b27624ac4a20d5ed8e85b0f14658f609c84d5fa3dc8701c21d7e3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with multiple URLs pointing to potentially compromised CMS uploads or disposable hosting. The presence of numerous PDF link farm heuristics and a high ML score indicates a deliberate attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xn--80aab8aioy.xn--p1ai/userfiles/file/tixudebafatifofebop.pdf In PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/bajuduragomoluxitezomowav.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021080804170222.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/63209058127.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/gikowofasojefe.pdfIn PDF document text
    • http://caramelitos.sk/files/15130591945.pdfIn PDF document text
    • https://noddy.nu/images/file/fumitafewaluwelemup.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/18927348701.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0be7e25ba---lisodipow.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/872fd31205b1110616bbdb77a1466635/72700024006.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/32703385456.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/lidanesitewitu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ci0mijo56dmb6n180182par80l/41359696590.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2e9ee0e359b3a258365ad8acb14524ea/78893861131.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/virilesalonupidizanu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1b746ffd---85353274070.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/45656474198.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210808162750.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/sagujozujamajetopa.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e3b53a9e45d5c0e66830b52e3463406f/8024014835.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd20427593---kezilamijewiriwe.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4ded9b62c8163f6debc6aac28a205e68/15058449635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=speed+test+latenciaPDF 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_off0000bccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 10360 bytes
SHA-256: 148f56150bef0f902b414b7d45a594f653ffc463a383321d31565b4312a50935
font_02_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 17424 bytes
SHA-256: 94e1687832a04803e64bf440da426a14c392b4f0e9bad4c767040252eaf9bf3f

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