Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b0d80f8b868d29…

MALICIOUS

PDF

106.2 KB Created: 2021-07-05 10:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f285d5f2a46fa53552998f6af3add31d SHA-1: f0a234b226fe463c5765a9bebe21b1ccbea9456f SHA-256: d8b0d80f8b868d298b4d161536283a2c4a0cc3710a821c9ba3c57a77b2cf10b3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites and disposable domains, forming a link farm. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://krisoc.ru/uplcv?utm_term=another+word+for+homeostasis PDF link annotation
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae227792a7d---44136134923.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2eb74ed4790a9e3f43eebf5731f37651/wozowupesubagovuwoxorez.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/bawidimizowavivixubomo.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/raneda.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a487f6c0678---zalevisusavekuriraj.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-10/20210510060134331019.pdfIn PDF document text
    • http://splogservice.ru/content/file/54464366843.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/zitadujazutuxamego.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/bekelegagavotatamokesoku.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/gitatazoxitulezosabikipiv.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4u0mge68n8grc8q5r03c4aibjr/buwusenifikupugifubezigub.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf70f2715---wafilimuvegefakagorefew.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/74772349280.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1252a631af---45819210737.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b5242f8927b---65943791460.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/12b64e91ff6ffa2a5d67a07181dd3021/88427495109.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pra0h7913m5d9e9t9bq7cimukd/21429971929.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/71395368277.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608755bdc5084---lebisuja.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160879ae42350a---94865440446.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/vavikutewaxusatugadawovu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/939de147a1290ad5b08b472a49b45d32/puxanazer.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 10640 bytes
SHA-256: a3a6bcc4598972dbc748c74514398dcaec81a56c0956b732bef08a054195a1bb
font_01_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 21092 bytes
SHA-256: d74c44fc7adc6f6ea5e45caf8ce68cfb1b967e0fbbf8393b86f13ebf25f28c6d
font_02_sfnt_off00015d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17570 2976 bytes
SHA-256: 3a1fe8525d7b3b5f4ef5bad8a7428070e514291842d45fcc6d616a9e24f28d8e
font_04_sfnt_off00018196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18196 16572 bytes
SHA-256: a1dab9944a4b7617bfb31a6afac0629738674338bae5ed02938593e0f5efbed4

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