Malicious PDF — malware analysis report

Static analysis result for SHA-256 15211bab48a83dab…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 00:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 277d9cb7cda87f38fbd1cfc8e385e2fb SHA-1: f950aa25f3eeab0b8f3dc69c8f040803ca3a03f8 SHA-256: 15211bab48a83dab764eaf1faee71de5772ff91ff9fc64ebee3ec2631cb7804b
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/gezuri.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d871dd1632---vidotowudikij.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/93538871803.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/xafafosivovogif.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/kajer.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/mugudidowepaves.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/ravamo.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/leliwunapinilifutowa.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160942127a818c---jutabid.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef45ae350---nufigela.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/95172733589.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/natibovotiv.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a103d10934f---rewurupovi.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/sibajidanifiperepuzi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2495ca567---baxifojigoma.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/89703006788.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd8465f35b---55211449655.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///71666089922.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/tadajuwu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b133a5c4b---xabozi.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-1/20210901050815672553.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8unss8t57kpcbhrkrbvrq2mje1/1444597222.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c7744ac1f12---xakojal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nationalism+in+india+objective+questionsPDF 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_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 10988 bytes
SHA-256: 7da864ba7140dcea95383609312fa7a512414b8c44d3f737cee41864cd1c7b04
font_01_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 18340 bytes
SHA-256: f062d2bfc3d5704cf3ee910ed9241759be99021d09faa5975cf986db97acfa36
font_02_sfnt_off000138ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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