Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ce27facb75cc49…

MALICIOUS

PDF

82.5 KB Created: 2021-09-26 12:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: bc7b7f38ae2b52fcb3f0f270af24213a SHA-1: 984c2251a82e18450ac8868f3b5392a2ce0218f9 SHA-256: 44ce27facb75cc49a9ad7df81e3e3c4c64c1554183c85f005c01fe53c383cc0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery, leveraging a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161450901a03a2---daburejawoziza.pdf In PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/waloganojibag.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/13247027120.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210916080952.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/femulinotu.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/4971951047.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/torowijise.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/67690715684.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613328c4d37f0---zexumevilipej.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613508eb221b9---38297343353.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/wewajulurupeneganiput.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/86785858035.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/bagilebudar.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/82500301385.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/xiginub.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/64081633988.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/peraxoxaderosag.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/woxejem.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/sofovesakasa.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/72412316726.pdfIn PDF document text
    • https://remini.hu/userfiles/file/31450070279.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/50516825827.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210908164311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=%E3%83%91%E3%83%BC%E3%82%B9+%E9%80%9A%E4%BF%A1+%E6%B1%82%E4%BA%BAPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA91 8984 bytes
SHA-256: 1155eef8b03fb48db8196c62fe92ea0367c3129ef5e52290f3da045cb9446085
font_01_sfnt_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 4836 bytes
SHA-256: 7cbe8e526e72f6ba9377072138a46af12db65d9113d3da5f04cb5e782c25e0e3
font_03_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 19796 bytes
SHA-256: ca0966d36ae6fe56afa173928b253532ab3ea8af925e57b4453021cd2cbd97e6

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