Malicious PDF — malware analysis report

Static analysis result for SHA-256 a997e220c05cf4db…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 07:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 679f96ec35289cb2e8816c2274a19389 SHA-1: dae65fdc023e2286ea9305919bf6f688d4bcf698 SHA-256: a997e220c05cf4db62321981bcf3d379080fdb710cf616e25c877d5fbc631e5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and content are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://wooshin.kr/uploaded/file/960889599610f1b299169d.pdf In PDF document text
    • http://geoplan.su/userfiles/file/95564654727.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/30955537599.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/xegatefemipaguwigemexam.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b52d0c8caf3---27717405215.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/64988141430.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610d993828cda---29152151260.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c27d378e2ad44a41ddda65f4503dbd0b/marer.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/dibobop.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b8406a9c8c2f01a43c072dc037490ad1/pidexe.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/3323274650.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e95e9f2fce---rototogawudigiperajeduvi.pdfIn PDF document text
    • http://teplospectr.ru/images/files/45649231859.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/xivugapizetinaxesi.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/muzenewegasudajotokuter.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/jalapetedekenovemelazet.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4643838569524589365a284f4d2383ae/mebexilofudet.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c0f097c07---wudilidovadibudakoto.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/misutufetodujiden.pdfIn PDF document text
    • https://ms01bet.com/contents//files/lubilosonem.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/pinokemokevetonaxapod.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/693b8bfb1a4b3a345a4f61a791b67057/49930124910.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/44853686989.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/eb990bfd88fa11bd780979522727d2ce/34098720780.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af5248ed150---95862838170.pdfIn PDF document text
    • http://parentini.it/userfiles/files/kupukoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=thing+1+and+thing+2+face+paintPDF 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_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 20276 bytes
SHA-256: 0399c3c0f5d8509f9b8ace8d8649da9c8386e3c0b12f6c3438e21bf230282961
font_01_sfnt_off0001103c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 10600 bytes
SHA-256: eedcce4829b2c20549631e2d63beda27983aabeae018b84258f5bab94b488d91
font_02_sfnt_off00012848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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