Malicious PDF — malware analysis report

Static analysis result for SHA-256 374845ea55d262ff…

MALICIOUS

PDF

70.3 KB Created: 2021-09-16 23:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 985be33f043f37c67cf05f9e0ad1d5f4 SHA-1: a66e950483e97e2b5310ed35e60791aa66195179 SHA-256: 374845ea55d262ffa010ac4f03b4fb002b5470f78f84e1920fa354aab0da18b4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing and trojan activity. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=zelda+ocarina+of+time+master+quest+rom PDF link annotation
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/govebexix.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/xewusidefenimaxi.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/lorefuvowamitiregakimev.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/demoxatuzubiwakomov.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/difikeferu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b2c4c46c903da01249eb7772a91a9b71/99481202009.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/tipodozifawopekup.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/53268345068.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/79836931998.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/677c7ddc053a4e446b5577876bc2e220/kujakebe.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/58369968997.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/mulujamabilakuvomo.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/mijalanus.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/90064362575.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140721f1341a---40604541971.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/41328787597.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/nabumonozol.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/rilujuzobarawu.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/92547287630.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/dofovuvujotomixoxonanew.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912041616.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/46254607644.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/duwisifumek.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/dujojotapipisemifixemegop.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/92683299168.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_off0000b26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 15876 bytes
SHA-256: 1b96750496edb7fad13c8b9d9be6613588ccbf32cbe289ddc36bef6e342a55c8
font_01_sfnt_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 10848 bytes
SHA-256: b9a55296de8810b99c3894cd358ed7c07b77c6f537bbbf26bd55a72bbd8ba698