Malicious PDF — malware analysis report

Static analysis result for SHA-256 18637a7a69679fdf…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 16:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e75de78e0eb1eae75e089ca14215f028 SHA-1: e8ed6642e36aa8cf738f22c49c59158d7f9a88cb SHA-256: 18637a7a69679fdf6c6577f517e9145efb8d3411252a8107cc3dcda509fca5e0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely serving as a distribution point for phishing or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the use of disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/5982814596.pdf In PDF document text
    • http://potlista.com/file/files/mexanegevib.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ae2705908814fba339c1c878b6b67f3c/9538263909.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/e39d459811d4c67f4b1d12785b2f19c4/razuboreb.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/nimukatizoduxasotetupam.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/08/20210802135100.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/kuvexerozimenimojuletug.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a37cf47f---vigogejenilejufivonuvo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gngvncm8095fulef5gpccj0odc/90244556333.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/78493754249.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06c08b1994f81c5c6510be2dc54e5ee3/37982018012.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210822_07171BDB72323A08.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rbj3sdvd410duahtcqfcdrjd25/ratusedawisiwenubudutu.pdfIn PDF document text
    • https://arerp.kr/data/file///49557512802.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb24e1097---28928128531.pdfIn PDF document text
    • https://menu2uplus.com/images/file/modebalakuzete.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/t3lhbon8glqo57ohff2p7shbk3/68699263516.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/a83d616c06de1b957dd08479bdf82d16/26540292350.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8c661b497---19660166124.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/najavesimobozuxujedoxa.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d98bac52b6a---wexunedemidarorifa.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b525570f950---51884772783.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/wetej.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/pilufixuxigenevonoresotu.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/64674925329.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210818/file/seletizumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+13+british+coloniesPDF 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_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 10492 bytes
SHA-256: ddc85f4caa33e0b0eb396958a44b267c49e86cddc98a8ef6f40f55d023349e09
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 16904 bytes
SHA-256: 8eecdff3a7afe81e6d39c120d1bf439d9da165c63543437e5f5bdecffab83e06
font_02_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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