Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a4c2ab88b20c99…

MALICIOUS

PDF

87.8 KB Created: 2021-08-13 03:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3160c19d594a9b3c715bea0b9ac22b3 SHA-1: 44745701f65e4beacb9535cb279d9edde7dc8224 SHA-256: d5a4c2ab88b20c994ddf97e783ed5395ff9cdd20830748fed5eb8a70b3f13e33
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The document's structure as a link farm suggests it's designed to lure users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/fdaf4b38cdc93d0b94fe64633a6feebd/lonam.pdf In PDF document text
    • http://e-sportis.com/images/upload/26655779689.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0f2f17036fa7af44a2b06827eeea36c0/38930308756.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607279c7a3c0c---gapewamerubu.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/zutigawibugove.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05b4d9a18---zuneme.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/p4u61nfrvbdavotuo3rb1asjk3/niberodajodokikavokeki.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/xuzip.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832762b5ad4---wirekixinor.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/2988399542.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/3880883993.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4da2de123c---pikanatoweron.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/70df45f51e63998e7c467add8ca5bf7d/30554552062.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/883bk1nra6subngm2r6sioq3to/58226387542.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/basuviluzedukuzavonuvosim.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763491b510b---40231923995.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/jaguzet.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b7501522a---2610229076.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/99666100591.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/48769085d108d283f464d075eb46a17a/wukupidob.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a685f3259bd65739a137e35e713fdcc4/xovezalos.pdfIn PDF document text
    • https://activepymes.com/pub/file/51324734054.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210709_5B89C2E9461A3563.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/75127a3d7fe6c3431348d80fe46cbed5/57861772942.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/sesagojakexisanaxipagadar.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210730_165539.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf2c5a106---234003309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+read+bosch+dishwasher+serial+numberPDF 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_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 10952 bytes
SHA-256: 7278a3913cb9b74cda54fdb06681bcb1aec0555621276ab35bf9238e3070141e
font_01_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 16912 bytes
SHA-256: f933ce23ae4ea1ba3c2340e30a9bc4c0d9acdf6ed62a428ae81e30fbff085015
font_02_sfnt_off00013917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1