Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40e1c2a0b557a76…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 15:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8538868a5ace21dbb25642f2786cf74 SHA-1: 40c8d6bb2fabfe68b8a7315dab23eaa71b0e96c3 SHA-256: b40e1c2a0b557a76b9348a7e227b68eee90cdc428ed3b0a2de9f339f801426ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://fipjp.com/userfiles/file/mabobotegutufizarefevobi.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c9c334ab345465729b11a24bf3cb2d95/11498718392.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/meparejadatizeliloxu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099fee815fee---segumawubupep.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/29018168386.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/65623571493.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2377a0af---fejawajawuwupave.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2qkj4df3fg8a4v57dged028mna/tonorura.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/73065026177.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/rapabagigavifavatedis.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/61988034871.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/lbh157r036t5sfo50ehcrm0o5f/sifepugezedije.pdfIn PDF document text
    • https://parc-hotel.info/file/4419079128.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85724db040---55680021936.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bff584151---11667810384.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kararomedijilun.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/kerurukimanefotokupog.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d2d63b2f6adc5019fd7507773f974d7f/44222785198.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3fd5cd71---939904190.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f88f38ccb9a9a94348ee07a051693e85/napotejuwuwirekojavozep.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qak165pcp9m1s6ak1ihuno4qb5/59279939171.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7468cff1---lefadigik.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/31432549921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=david+repentance+and+forgivenessPDF 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_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 10816 bytes
SHA-256: 938d74952a522b6d758389ff9559a7539dbee2350b8885beb2d23a50ad81349f
font_02_sfnt_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 16332 bytes
SHA-256: acbdd94b550ccc3e4a6e2e555314887b30cfb9dd35fcac371d493570ffdc17da

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