Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d870023c05d9421…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 12:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7925a4916f26eb773c4d2d8b5b6f6ed SHA-1: 5806549dad56deedbeafd34921b74042162a719d SHA-256: 4d870023c05d9421d3a2a2e7a4b48ced2081732fc1d1cc8d476d0269a60e7ca3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting, likely to distribute further malicious content or lead users to phishing sites. The presence of multiple external URIs and the link farm structure strongly suggest an intent to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076f88b22d04---11230605800.pdf In PDF document text
    • http://fernandopelosini.it/userfiles/files/74136878274.pdfIn PDF document text
    • http://dalaichau.com/files/rotonut.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/7ks14ip58t5lc8hav9l3aog8pi/rimelokemivup.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/sezijuda.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/37941751350.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2165d8cac7ca6d48d59190d8f0c496ec/1952791504.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68d9c35f1d---zozagavubodivux.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/doxewimosuzibeme.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/nugojuxelonuwator.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/2219812300.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/84bb0e7a4ffc5c262965211f8d3df001/90654404817.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/974854b65f1ea520a1dd24c5b8e2bef4/3984144697.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4a86e78c6f9a56cb969710703e0f21c4/27651024183.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/62845512308.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/figuvuwajetamajasaj.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bapidojimibosumesagetun.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/dusunatoloparidatajuxos.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611687bd963b1---8647603079.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/xaxuvezilulafibetesiz.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/do53fmgjjeemcjbb0rjvlfh11s/27695138629.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b461470beca390bc74aa9d5498c30b6c/70455181548.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/4elk5gmpdp3m8s1p70nqe38ceb/97446972526.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bajtn5as33ef6lkokcdbrnlfj6/mumevuwunoxuvozifo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9937e137da---magiraxepevuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=anchoring+script+for+bollywood+dance+performancePDF 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_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 18440 bytes
SHA-256: 811fa8a06e141ead784fd2ca3006f48af2ccb99a1ad5390f13d5f7239e24d1ce
font_02_sfnt_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 11388 bytes
SHA-256: baf41881b2b9bd527290ff16cc467686eb6014ca3a8dd67d213318ab0f266efc