Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f3286b7e3b9572…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 05:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0266b5ab3bd9e077d01c660fd86a79a SHA-1: 73d6f6d296bdaf7c8deceba887953de971af1b48 SHA-256: c0f3286b7e3b9572f27e232b4cec5f54d081f069537ef1bfc0e4b38a0379b107
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of 'utm_term' in some URLs suggests a phishing or tracking intent. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=multi+exposure+app+android PDF link annotation
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b0d8a96918a73940e7bb0b09adf451d8/72556372693.pdfIn PDF document text
    • http://nscenter.cn/upload/files/julamosusopi.pdfIn PDF document text
    • https://dptech.vn/uploads/files/19278202626.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/wibolesogiset.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/lvdo4352u0k14pu8l3rghmk9d4/repafopiv.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/sediru.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904160008030.pdfIn PDF document text
    • https://aashianarealty.com/file/28992888035.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/54745220664.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613597737e383---naxikesolutubow.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///48527987720.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/26637427189.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/fojixadeguvixerigezitobi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470d6f17909---82319381528.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/4067284982.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/26572023516.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/13896193834.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/narotaler.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/82621613129.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/23870311389.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/64318070163.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/xejifanafobutepugina.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/59446225741.pdfIn PDF document text
    • http://net-marketing.hu/images/files/82133577535.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/15722332179.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/45655954532.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_off0000b4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B9 14812 bytes
SHA-256: 437e5007955ac7a3e970ee46eb6caa43477593d4863399768cd96ab58b33fee4
font_01_sfnt_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10580 bytes
SHA-256: 3c7ba617678626b451ec58a44d8004a88877b32f2ce74e86f3650065a00793b5

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