Malicious PDF — malware analysis report

Static analysis result for SHA-256 f354d32149b1bba6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-19 17:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18b44d3d605e86d38a91d7d80950a5dd SHA-1: 40f132133cbf1634d06643591460e4ee0e40028b SHA-256: f354d32149b1bba6498bcb927d6bd96422c733a1c5a5b0c6e99ccf2ff8d28bfa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by multiple heuristic firings related to URL link farms and compromised CMS uploads. The presence of numerous external URIs, including one flagged as an algorithmically-generated link, suggests an attempt to redirect the user to malicious content. ClamAV detection further supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=videobuddy+latest+apk PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614474b341663---nabasuxuvubapagututevoz.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/32uisa2h9497i04mptrou8ml51/19762088002.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614179b363ee9---tenibujuze.pdfIn PDF document text
    • https://adikkedua.com/contents/files/welipewubawabakofebi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0deb774f---12383010791.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142892b8b615---sixibokukekat.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/44441036653.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/10638075387.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xomitufej.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/lekebem.pdfIn PDF document text
    • http://farmina.ru/uploads/files/zukavukagogedadip.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210913_040426.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/luberogezisulogesixoriv.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fuwedubilixikepegofalalid.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/208164610.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mgr1opkqduuc2giv676i43arhq/68506620581.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/kosup.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/pafaja.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210913180737.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/guvavujigemojifajux.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d8db5ba9---99312076416.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/wuxewe.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_off0000c4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BE 10596 bytes
SHA-256: 440abdda57872502a876fba853c0ee0d9464082ed66bc8a48084fa92263184d2
font_01_sfnt_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 20228 bytes
SHA-256: ab8c07c863e9f3692cbde220b18f0119e96a8a18dc4fd988218ca2d6f119c924
font_02_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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