Malicious PDF — malware analysis report

Static analysis result for SHA-256 addbce3f5eab524c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 22:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b1bae8386ce0c6877314a912957cd64 SHA-1: a3d84a7bbf1eb7e02d604b74b68ed1ca2defc094 SHA-256: addbce3f5eab524c3c65d6d335936b722ee6bfe9e182e174270929d06fbb0611
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. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports the idea that the PDF is intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a64cb0bf6---nozurumovofasadob.pdf In PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/afc540d5eb631dba7e02e866269f6068/kogegidubupusazonavapir.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bcce73d65---57201980752.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/97345797210.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/27f0eccf19e81f887d3a677ead3f60ce/78321011966.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608be9fa95657---33477407739.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/386dbabf108be0eaae74091005b61964/kawafuwedomepevukufosej.pdfIn PDF document text
    • https://chptravel.ir/data/file/25157800702.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/nokaxu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mikigizurekataxulinopej.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/gapirejojoverejudaxezo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/mfsgfvi474mrf9mmnhrlk0131i/joraf.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gedurexanize.pdfIn PDF document text
    • https://purefeeling8.com/data/file/menejoduparudaje.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/nulitedegarum.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea91d4b92---23522590961.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/92780712796.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/85302583969.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/natunusujavelojuma.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/ponasa.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/46724795230.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/jepakodefemub.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083460e2a46c---fabezituxinatokegeri.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607faec71543d---dogumemakelupulatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=feroz+ul+lughat+pdf+freePDF 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_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 19572 bytes
SHA-256: d7277a9795924641817ead2ef25ab43ee93d3bb8f6ac26740f9429fcf8a89fa3
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 10552 bytes
SHA-256: e100a389bd3b485898c3773610c65fca22877b55a84ecd2456b17448feb0142c
font_02_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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