Malicious PDF — malware analysis report

Static analysis result for SHA-256 49822b44416cdb9d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-24 03:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42fd5eb736b485ca5d308efc06083c31 SHA-1: 0a63d13e03052729977188bab016b075dfe7c14e SHA-256: 49822b44416cdb9d389618e01f70a8a478d3b6eac99b2f4e2a8d60c69c65f4e2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://kxxbs.com/uploadfiles/file/a/32229817848.pdf In PDF document text
    • http://tonioloclaudio.it/userfiles/files/runerisejanaliv.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210917020750962.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/14783579956.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/92310750417.pdfIn PDF document text
    • https://n-tlg.com/files/file/nojamazegamefisopigel.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/79eq6grvfrtpf3rfv77fa02q4i/vujiwa.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613255a275959---35704498080.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/21/4710324672.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469885100e3---28929934022.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/q9fpcmgip8alk6c2pssj7plssc/bonugenawadimekemonutipax.pdfIn PDF document text
    • http://benetalent.com/upload/files/44438728287.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/37587678974.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/gapawoxejidub.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472db813145---99218483416.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/pixexuziviwofesanam.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/tanusafobitix.pdfIn PDF document text
    • https://anaksemut.com/contents/files/xivuliritokok.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/87279767733.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/bufozodazibebut.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/koruxutetubizowedaladuk.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/kodafupiteji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=among+us+apk+download+2020PDF 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_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 10812 bytes
SHA-256: d3741033706f8a044c89872a933ddbd9231469d9acb6e2b2ec8f0c7713a0cab4
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 18336 bytes
SHA-256: 927291656a8ca43ef96ea1419257f1dbde6db9e5b7c97071c0446f9adb9cf58e
font_02_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1