Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fda4d4849a16de…

MALICIOUS

PDF

91.4 KB Created: 2021-07-29 14:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: abfbb4e8fda09c9171a2f1ff1ac357c0 SHA-1: fedcc24d379a9bd6fc41d35f0f51b9c92fbf1a66 SHA-256: 18fda4d4849a16de817c36f80e4daf8812fc260ed6f74608751e1de73400fdf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous PDF links on disposable hosting and the use of UTM parameters suggest an attempt at SEO manipulation or directing users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://aksaaydinlatma.com/img/editor/image/file/doligujuvemaluwijugiguda.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0e4d2364609ec6fea1203b62d3662635/70406667309.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/xatopogetemojezomatuxidul.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/419c5d6c4fbbd5ef5bfb2d2661fc75b2/98048576355.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/20ec55de1142c37316b1c672ae593b9b/9086172739.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790559a94a7---43671219930.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e98423a1f2b154c47fee62568111e9c9/6940486587.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/51841122341.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/loboxulewusisadel.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/af1336b9a97a63389f2648443cbda55c/nasimobiza.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/gepeduzipix.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/sulenumevozudaxepijagan.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4bde5d47939acf2a831a431c0073e530/3201154475.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/59108722490.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061504501868.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ia4iobl48c4naqr5pbn1c1rtjd/41091687040.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160717a934e06f---vaxivob.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0e48f990e4b8570822c1b1883b7ede5c/sijepusitilavavevedeju.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/48941584723.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ab9d46a00a876a66f879ad9f4e8c6310/dujifipeluduwusobuf.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/44529167402.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6a3e047ae09fc8a5cf985735543956d1/siwilazufinizir.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160759288470aa---52479729579.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/76be2dfe582dbcf9569cba0d6d3abe06/xabelegefevosugejavew.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/gojula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=who+is+the+richest+man+in+nigeria+todayPDF 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_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 18024 bytes
SHA-256: f66b8e6e595c038de345c649d276bc0d043e17c293856666b5198760cca79f36
font_01_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 10876 bytes
SHA-256: 5681940d8467101a64e0fb5ce29842ff0e7cb39f0265ebca0cb8315ada506225
font_02_sfnt_off00014602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1