Malicious PDF — malware analysis report

Static analysis result for SHA-256 0876316c1a0e85e3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 16:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0ded4aa103c296a6bca3fb6ce54a9814 SHA-1: 4cd18e740437080c9cd2d6f19288adbae2b8ac3c SHA-256: 0876316c1a0e85e330a26a4a06a5b05380bdc7cf9c46e0451b479b53efdf2d69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary intent is to solicit sensitive recovery information from the user. While no scripts were explicitly extracted, the presence of external links and the nature of the lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://synerhu.ru/uplcv?utm_term=download+terraria+apk PDF link annotation
    • http://enjoyisagenix.com/ckfinder/userfiles/files/45253965973.pdfIn PDF document text
    • http://ge-mak.com/files/xulumisutananej.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/88127635466.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7ca494a4---fijopa.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/16871934046.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/65263331302.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/nanejej.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/zopebusodererepifevivox.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/7b02f9b38db4b8faa12e1ab1b1d8773f/jijinene.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/32112970816.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/kenikawomuvov.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/kuzavemopedoninoj.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/81551147455.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/2614227400.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/29886425500.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fipelapixezalumegami.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/lowojuroriwasunorisib.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/38419077934.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/gonul.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/2340224109.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/10733390310.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133329eba809---rixewolixutemumot.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/sijolobutoro.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb5ac8251---wagimuwuto.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/tefukavepuzegutiwavu.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_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 10396 bytes
SHA-256: 021f989c4a4cac66c3e7dac022b2f64433bf375342365d923bfba62ec6b6fa93
font_02_sfnt_off00010ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 17748 bytes
SHA-256: cd3c2883a42e5cd1b3846bb75d452d98d8c3228a45346595a76337746907b390