Malicious PDF — malware analysis report

Static analysis result for SHA-256 368971bff9bfa5cc…

MALICIOUS

PDF

103.7 KB Created: 2021-09-07 05:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da521fded7b6477214749e664644d8bd SHA-1: 6b68558c2f170c12936951e8c76ba7a422a2060b SHA-256: 368971bff9bfa5cc53a9cf49ae5174364d4bea9e523bb07b2e642114757b03e8
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/4251f69e5d7fcb40a259e446bc34c2d0/xipebogileseg.pdf In PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4584fff5dfd71e07b1fc08eaf7c7e6d5/felopemupixuked.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/5866004898.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a3ad3f54d---zegosarolezakuxilusena.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/30117271852.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05a6e8d6c---zokev.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/zujemakus.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/21f43d9c45eed458a97dab0ae738942c/82143456869.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e91c0547---28309436938.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e40f53b4595---38115708312.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cdeca0c4d5a---97287498015.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0abff531cb---12402952345.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6799b42e---sexelurapokuzapifutowam.pdfIn PDF document text
    • https://tangente-mag.com/img/file/77069401340.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/fodupofutefavikupusa.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/imetqbh5ti2jd8km7u6e674h85/52147420571.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f230c42c688---5016753997.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/15215321616.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/280824174748.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5f6c2437---93600531427.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/71e3e66c5b50b2e1fd8b2b727f56c308/mejutikulatukixiwuf.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/vujonivetagalagekagizo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e909b636a---tidowagomele.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/29207086853.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/tudemakazavi.pdfIn PDF document text
    • http://snft.ro/media/file/rijofajawila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=model+pose+photography+pdfPDF 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_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 18728 bytes
SHA-256: f6d5835ee648c02023ef4b887fe00eb08eab28c5fa61915c3a4935004c681809
font_01_sfnt_off00016044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16044 10688 bytes
SHA-256: b147b147eb9382719eaa54c38a9c7b2d0a36018d4cfef229dd2e38a96388cae4
font_02_sfnt_off000178c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1