Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36ea05298e11784…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 01:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 530881f843a1696be33b9a40d22fe78e SHA-1: 08a54592860cd909e340faf45e3e752c2be1d048 SHA-256: a36ea05298e11784dc5d83ac7cc95ae34040f8f5f7fc8a1dd914fcaf9ea40b86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://thebankcardservices.com/uploads/files/denobisuvifokaxaligu.pdf In PDF document text
    • http://duhochmis.com/files/uploaded/files/xokejez.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/ganiwetewatibamunalisute.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/nomujaxonolitomatefitit.pdfIn PDF document text
    • https://giustofiori.it/file/40432525233.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/58364217000.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb3b654931---ronitodawemotofokuwokan.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fbca71566---wuxiwazikelitewo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/m6lfigld55mo7mbkqp1juqurau/majililozatemaxudosotu.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160876353b634b---42291627828.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cr824fuo3qvk351h6g419u1bpt/53427354939.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bewonisofu.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/nexejizabu.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/79540432836.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/97292654184.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9d1236d5778a345752b3217a27ae2268/60191568606.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202108210127281705.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e9efb0d95---32515514356.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecb20b57a9---lemekibijajemivazox.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608746d70849f---fabipimilikotov.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ka185q64815bkgbbfgcb2ta0a9/16911686629.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083108cae0ea---fopat.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fajarekogirujikumuradit.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3dff93b44---kovatoxozilekulaga.pdfIn PDF document text
    • https://icbacademy.com/upload/files/56995222499.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b330dd3657a---20617638107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=grindex+minette+manualPDF 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_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 10364 bytes
SHA-256: 1a2f814f89a53e3abfb0e16e6cabb5ee885b309fc43793f4d9386d4b9f6f1620
font_02_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 18216 bytes
SHA-256: 8b317bd8d171e9f193ccd9e4d7e315f15852f0a2fc3b286cda135de49a595ae5