Malicious PDF — malware analysis report

Static analysis result for SHA-256 387d065b666f15f7…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 18:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 254603d204e3210470e24bf7b07631f8 SHA-1: 3337ae81a0e84ec748265970b5ff9acf42540dc1 SHA-256: 387d065b666f15f791aa3ec8272954b3b789685acb5307e67c151fb7faf74aa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://kibbkw.com/uploads/file/30111560084.pdf In PDF document text
    • https://memoservicesrl.it/file/paburibap.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/maberafe.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/waxepeveruj.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ec06a27197b29ceb214e10949a253629/mukadevogiwe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ee9tuc73jjso7ec7tl531kip43/velotapar.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/75645334212.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/6531225559.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/wegojibatijol.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/62547656318.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/sutafarajidegidegaxije.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4f3c0677d47590785f2fb251d2f61466/69541171624.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/jawanij.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1v41hggp89dpp0viqcfql74ck2/zapud.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/8ddc9c811d34fbcfcf5932c8610d6ffc/xebowokuvulozuvexaxi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/40303295238.pdfIn PDF document text
    • http://nprofit.hk/userfiles/10454939187.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3nbqtp6tu91boulebnd2v7bvg4/tedujaro.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4c4893ee---nefenegigamudoki.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e75059a1---jepokapetojewaxorolirivo.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160897cd3b4658---65709285042.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8fb5e6159---zobupidixinozovojigegix.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/boxanuta.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16087f67104920---vinizileduzigagowoxar.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d125c81df8---39011813838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=polynomial+class+10+cbse+important+questions+with+solutionsPDF 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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16088 bytes
SHA-256: d06246de5fbca08a8e71b3266423534d5cc020e17a1f81eafc946de7058d617f
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 17284 bytes
SHA-256: bcc6a5cb2fdc84bbad9bd7e0e2a88818e8ec4bf02e3a3f73e2f6c7b8f41ed5e5
font_03_sfnt_off0001384e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384E 11400 bytes
SHA-256: 8b92a9034579c8886e6766be640b04c2164eecc797ff2f9606255d638024efb4