Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5b69de6e1a04a6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 12:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83ff7c79e8389f9417b23da69d02f984 SHA-1: a6573620f464ae3b4ac00352f358c0c87ca86c44 SHA-256: 5a5b69de6e1a04a6bce32e837785b51f78028c002a7c3373fe39997adccb9858
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Numerous heuristics identified the document as a link farm, with many links pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=little+prince+pdf+ebook', suggest a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=little+prince+pdf+ebook PDF link annotation
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/22c1a13d746fa91cd60666a7aee08fde/25885466003.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/eenj23ctsl6mv350r1ibbrod60/tivabutefuzevejoro.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e98420fd1---49564614414.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/31077515736.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/63514176943.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/vaxilujapepesuxonato.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/49418136145.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/reremikanerovitikufuvikig.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/30adb26398e2374ba8529000e446118d/vamuviwurulanoleno.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/95360303096.pdfIn PDF document text
    • https://beaszemin.com/files/finopemozazetonaxenapot.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/49518499631.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764abbc143c---tikubumeminuzumasinekawaj.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/71361830255.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/rosogapin.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/61765291405.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/virovewurupisezopuwazaxu.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210805014248.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/supalevore.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1626344746ronugilotuzalubuvel.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/rusames.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2ddf25e5be8ac94e55218510939b5e1a/jesupimob.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8485a49d1---27433586769.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_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 10472 bytes
SHA-256: dff3b86d0bccf30b67e461489e7f05a5f9609bbe9810e2862ff7c4fcb38352ea
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 17176 bytes
SHA-256: b0c8b968100342ad30c212dedc0ccd5df0e3d0c4be5e2775603acb622122bd87

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