Malicious PDF — malware analysis report

Static analysis result for SHA-256 7478b7def51a51c3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 22:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 358bdf8e048c1e7b86836602c0d0cd38 SHA-1: c4b66045d356f73c17ad6fcf7735f106db48bb4a SHA-256: 7478b7def51a51c39108c5ab99151cdc9dd5caf4e32d77f1e54da11c821b3d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into clicking malicious links. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination or to track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://ceccarbotosani.ro/userfiles/file/logotivexulijiz.pdf In PDF document text
    • https://amblamy.ee/upload/file/migojoratutewiromi.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/36620132388.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/oi6n82391hsma0id16mr7rkdch/37085997391.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/20160500454.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/56796666010.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/40b6b2854a826ab6227d8f73506246d8/68655315951.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/81572384767.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/84749188452.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/35006969765.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/59432041020.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3bac744d01bf375a2cd31b76b100200d/80800492307.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/22907944102.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cb22338b79d---xupejepaxasubug.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717e79da365---kugadiwo.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/najawexaluve.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/4712366168.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/jisuzoxala.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d45ba4df29e846e3c570ec9e730637de/xofitimab.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/jeforirurato.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a61bc62e661b5ae013890026f487098c/muwafoduwewoxeki.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/67736814497.pdfIn PDF document text
    • https://alkoplast.rs/files/mujiledaduxapodediriwoli.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/pulaguwiziroguwuvumujawo.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/rosetedopalupat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=folds+in+duodenumPDF 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_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 10128 bytes
SHA-256: dc21fd0635870e60ac652189960ecf24bf24bf6df2200f8413747a4d5c9306f5
font_02_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 16396 bytes
SHA-256: a9f61be27136af586652dd9577486d9499b6e60e84026219097f795d6b6d8e73

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