Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed2cacc72139116…

MALICIOUS

PDF

68.3 KB Created: 2021-09-08 22:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98c8782dd23c61df9369bff2921243b8 SHA-1: cbbd564adb8399700848f6146147ef659c6e22ed SHA-256: 9ed2cacc72139116f1e852bbc7b95e8d209127c13393ee05af0ba60a7fcfc02c
156 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 identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cd4ab741---tirivekinof.pdf In PDF document text
    • https://rwd1.thadv.com/upload/files/wanimezuwonebomenovim.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/48738701608.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ab5791db---mokobutuxugozox.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/54524046335.pdfIn PDF document text
    • http://kasand.com/userfiles/sowiboxanogojozijipigiv.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/22160327252.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/vuselokelozugavolupevore.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/52931157977.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f372308a72---jilabo.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/tibenorusafotixifiru.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/v8lb2tic4bonshm803fbctcbf5/65863700570.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/gaxop.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///35627102045.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/rekemutamamuwarikebot.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ab7d32b33---21449027578.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/24605144483.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/24901601073.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lk4ilu7bfmmql0vbjesfvrcki3/tinaduruvelojamejeseneli.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b692679ec60fd3e83635ddc3be2619d6/22268212771.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wadelijuperodujekudut.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/289870163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+dual+boot+androidPDF 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_off0000af49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF49 10260 bytes
SHA-256: 59d6fca6ffc4dd25026d55c3af67f66b7719f58282a7c800e0c66997cc2d528e
font_01_sfnt_off0000c65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65D 15516 bytes
SHA-256: cddfded6406c01026f19c5a53e4bab3cca2e53ff59035d0743cdd9b32b162e21
font_02_sfnt_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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