Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd105abb8d6b198…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 17:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 609eb790d641057e7ac05eaf685a6a1d SHA-1: 4d50dfc1f41baad193772231c80b75f31e30725a SHA-256: 9bd105abb8d6b1986705c96a570d70beb1d7917128399374b91557ef82afb8b1
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The heuristic 'SE_URGENCY_LURE' suggests a social engineering tactic, though the specific content is unreadable due to truncation and encoding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://krisoc.ru/uplcv?utm_term=apps+for+making+memes+android PDF link annotation
    • http://nanouklid.cz/upload/file/kozudubazulovujos.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/zasakexitomibekimi.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/76499813987.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/9920702142.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63840684849.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbda44d807---ridatanegapifuwefave.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/30103673881.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/gobefuvasavusuratabof.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/83an3322d56s72mf12sb4benk1/7162870181.pdfIn PDF document text
    • http://www.77ice.com/upload/files/43476957953.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/23253986863.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/46538549621.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecec06a649---zaguvemukizopuwiwax.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/rizekatifosoruzeni.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mugadusosiwabubepuras.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/kezilaku.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/opgi8oeuafb1nc911qh6950jc4/49877695699.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/20433338968.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/lalikikevonitazadadal.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9dfe8dc4b---fuxim.pdfIn PDF document text
    • http://mfahk.com/upload/files/sepanofusunipisifod.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/10936629934.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-2/20210902204832817674.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/gulib.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/pifotovofagirixijetojiriz.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/mujawojopalobotasukename.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109051251098977.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_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 10772 bytes
SHA-256: 69a718ccbd81af04b4e6ebf1dd81bf17ff738a701f70b6e08590769b63be9bfa
font_01_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 18000 bytes
SHA-256: b98054d842e310f8903dd7145a88f4b46f9845b5868a31ecbdd1d05a7d050540