Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ece4dcc3cf0c9cd…

MALICIOUS

PDF

92.7 KB Created: 2021-06-29 01:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4007d13ce1d09244e27b4c8f59678539 SHA-1: 2d1b70c8f91ddff926f0ae87674360d351173345 SHA-256: 8ece4dcc3cf0c9cd7698cd49876635306610abe4f36e1f07cc6f9d69e3a3347e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'curl -XPUT' command sequence suggests an attempt to interact with web services, potentially for data exfiltration or further payload delivery. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://oniceh.ru/uplcv?utm_term=elasticsearch+change+mapping+of+existing+index PDF link annotation
    • http://zdrowejaja.com/Upload/file/17375058323.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/43lb1plgaulnb2hk562utrkcc2/72890641533.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f309b093e9---fomavosolunirifubobasareb.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/63521102140.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zulidef.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4d6e2571bbf15c819a5f057f3fbe3761/45862683568.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/nebelinidegimukebusemon.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776cdee701e---soxezediripisepilizu.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/nanerotoputokib.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ga98ip5pid7ihpv3msuu0jigj0/wiruzasumakobepeg.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094f5cb91bf7---15866343013.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ee7f901a1---27144288377.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c01490b8d08e9262518cb7322e9ff7ba/zoverijubuvoxe.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/nejuzezikenis.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607900803f612---69773855139.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/25428521629.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e5008374f7e4da13aaf5c3ccec17a777/vobekur.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe807fecf---jolilumotizimolabiwube.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/7e4d6580e51b445529b76b726a518a70/88472993531.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abd8deb6c63---tutebilarubozuwizinos.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609033d20f75c---24955667727.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a49b039aa23---95491075263.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/10085869138.pdfIn PDF document text
    • http://${ES_HOST}:${ES_PORT}/_template/default_string_templateIn PDF document text
    • 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_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 11152 bytes
SHA-256: d35ae765962ea86eb9afe3f865989ab254e711621983da2b8beb6f8fb63033fe
font_01_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13410 18660 bytes
SHA-256: eebea71863d2266bd90f37ab8611bce3a31ab3f3807a539920b08547ef30df03

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