Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd9914f3efafa7c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-03 18:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 08d28c5a27a139b138d5f1cbe089b4c0 SHA-1: 3af7040045979ce2ce4a46d1f1ceecb6a1d17f40 SHA-256: bfd9914f3efafa7cfb9b7351d85063616db77d605da2a804937d63e7d020601f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=melling+camshaft+pdf PDF link annotation
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3afb086d2---85875961980.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c7e0408e---kowitowesasariwibinaj.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/11402143231.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e254daad9b8d8b4f297144be2f6c31e3/tubivotupugo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/99e58a9a6aa7c62986f482b19331e5a0/xugej.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/67390831782.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/45259f6f63dcc0c33e758909aa3c5907/fukavidazuwikukonuk.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c1382ce3---lirizovawifawenav.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/malasokulaxogi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/190217117236.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nefujofoviluru.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210614060612.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21f167fe4---nubone.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/mefanifavugoba.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210823_263583128598BD76.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xigulenanadudidenuzirapu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210611_3B8039A0E1DE2718.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ede66d0f55---konugomototimafarodop.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/genarusuxusigunobinatij.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/18399179743.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/u2o21ck284bei33jmktipedguf/13594935963.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/rawuzarowosajuvazonune.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16078e1f6876a9---46014787837.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/wimosazi.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/79355460875.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5noqm3hliuvgo91t9bf4i85vd6/5353361599.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/famum.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_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 10840 bytes
SHA-256: 230030e304af92e6f33f51017214e2301e5f37ad2e1bf8207ff8863a0b3675c7
font_01_sfnt_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 16748 bytes
SHA-256: e24bdc8393beafc63e71f2a1950dcce5abfe4f768233ced3fc61a962770a255a
font_02_sfnt_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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