Malicious PDF — malware analysis report

Static analysis result for SHA-256 f304c2425ef5ea52…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 21:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e43151bbce621cad4fe7a167a442d305 SHA-1: c19c35f1e1475bae7868790945420b9f92d0265b SHA-256: f304c2425ef5ea5252000874086d8df425e4ac6705dce300f99a321fa2452a4e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to various external PDF files hosted on potentially compromised or disposable domains. The presence of a 'download button' lure suggests a phishing or social engineering tactic to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=free+internet+vpn+apk+2020 PDF link annotation
    • https://bengalroys.com/ckfinder/userfiles/files/zisorejetenus.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/68191807143.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/getet.pdfIn PDF document text
    • https://mashura.co/userfiles/files/kozasudigi.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/47834204152.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/xipetanomivaxaraxevope.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/morumobasafozibuma.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/eb81d422b90444f6c0b801a3c1a82475/povori.pdfIn PDF document text
    • http://bjjiffy.com/upload/27791302569.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/8853675551.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/70967303002.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161322d5e41883---18546656571.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534f6c4a47---fadij.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613192fe049b2---jatijotetuxizunujegiwafuw.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/texuz.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/82063727229.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/subekimajetokepubet.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/99696285684.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/xijeruzesarumufume.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/99482407057.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/sotoganenekiwemalokig.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/xuzefonu.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/94933899367.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/q9fpcmgip8alk6c2pssj7plssc/bonugenawadimekemonutipax.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 10288 bytes
SHA-256: da2e0e6227f80599f86a6611aa875b58cc8906425d95fcd9cc1985d822107099
font_01_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 18856 bytes
SHA-256: 13f5455716f155c3314e588e3b5e2f400c4181ee724d86a12ed4ee00a7467487
font_02_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1