Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc7d28ae5ea1470…

MALICIOUS

PDF

80.9 KB Created: 2021-09-24 08:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef2c869cec4286694a35d6a0e1f33476 SHA-1: e7e7d103af63b45e739881b336fc5bb417705e00 SHA-256: bcc7d28ae5ea147028e34be72717566668d185f8d52f5b8dabed90b89be3fe36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The presence of these URLs suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=firestick+screen+mirror+iphone PDF link annotation
    • https://pvcmikser.com/upload/files/77990796967.pdfIn PDF document text
    • http://rollaktif.com/images_upload/files/71802006126.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/5416167062.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5gjr9njv250hijpl00husi0ec2/29572327062.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/fenuxanoluliwaremikagazi.pdfIn PDF document text
    • https://badrivishal.com/media/mutofonup.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/32088614329.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/maboputotusifusoxin.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439238d6c34---16982098456.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210904_A32FC72ABB79BFEE.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/70703929095.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/pakez.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/25145564668.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/lufefevisotiluv.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/34302067978.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148581e04b9c---55873532149.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/88874665698.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/0asa0gmopk77elldt3nb7ip7ke/12646036772.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137709ee13a5---38731376187.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cc98ae13---17474540357.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/gevalasoriz.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xozodorexexenozojuwav.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/kemamowalinuterowoged.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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 10500 bytes
SHA-256: bd45b68606ba28158c57ab32cf37e59762e3b7aa6991a0e06eca586aaf8f11c8
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 16908 bytes
SHA-256: c3f295978f07a4635c7b6b20d3203f6a0e6d8ca1a56ffe91cbb3541487b554ec

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