Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cb83c26abbf658…

MALICIOUS

PDF

87.3 KB Created: 2021-09-15 00:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf96655ca96dcd27527ea58d0b62b106 SHA-1: 59ba14122a3354afaea46be1c19c5e455d976f73 SHA-256: a0cb83c26abbf6584816db93fc44c899652e822e6d81704ec003723988feb743
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to direct users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=chal+mera+putt+2+full+movie+watch+free+online PDF link annotation
    • http://gamebonda.com/ckupload/files/12857130116.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dfe7414d---jabutaforebefimazitu.pdfIn PDF document text
    • https://petek.biz/resimler/files/72023743432.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/8150257620.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/nekerimaniba.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/pokol.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/45985089568.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/kifinarobeku.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/fizikinevevogezizorug.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210902001153.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e85d96873---riregub.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27d3dc96a1a9d7d85ac80a2cb27b3018/fagunaseba.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/24528204273.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/23607417702.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/86905850236.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909052216999796.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/jonetafaxagu.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31724247495.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/xefemusuwogutotiwemijat.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/64707651832.pdfIn PDF document text
    • https://emprenderem.cl/files/badafibumenimu.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/67265224923.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/23158599425.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c72d86fff---fonakaro.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/vupidakafuserumugixu.pdfIn 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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 10980 bytes
SHA-256: 92fd716b484c2e4e581078eb862e7bea737221e46e8a7b286d8e5fb467dd2235
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 17904 bytes
SHA-256: 26c0178c127353e528edc487e591e251f6d227fcce6f3353f085f5d17f85dfe2

Open this report in the interactive analyzer, or submit your own file for analysis.