Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2b74e00c48d6db…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 06:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98d6f91a9ae66ad1c0dba5028fed3210 SHA-1: 0de9521747811e71a5252fe9294de57105a8a936 SHA-256: 2d2b74e00c48d6db9ca0c2c63b5cc4204185bf568f92c58780b3973bf119cd84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful sites. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 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://synerhu.ru/uplcv?utm_term=chawl+house+tamil+dubbed PDF link annotation
    • http://gojjang.com/uploads/files/8672968344.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/66158364769.pdfIn PDF document text
    • http://yanartextil.com/firma/files/kutexarepove.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/gepikavibusekabemelokuzur.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/penapituvabe.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/26823613710.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4d2472ca4c62924e7af629857d88f4e7/76683648915.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/13407269385.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/54117706325.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/53bcae5087832f5527c04bd353179ee8/71334469153.pdfIn PDF document text
    • http://dogable.de/userfiles/file/nefozobebupewiteros.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/lufoteladepezum.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/78169483979.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/38208698351.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/22215306242.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021917_066_358.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/lowiro.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/kuzuxetuv.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/14020435627.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/kumeborosale.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/10385559017.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137e58a919ba---3086873186.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/42273531616.pdfIn PDF document text
    • https://manenshop.com/upload/files/siwuretik.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/zipozixijamor.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/57143376974.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_off0000b801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB801 10668 bytes
SHA-256: 6b58f4cb450509473d196cf6d0ea408c94c36575410f47c7f188ca9dae57a59e
font_01_sfnt_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 15704 bytes
SHA-256: 930627b8de6c5d8ea85eaa58efe87aa32866c17e9d757afdfc008be2d0a51acc
font_02_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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