Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a347722c56bcd92…

MALICIOUS

PDF

69.9 KB Created: 2021-09-03 11:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a70b012874d9a2873b01664ea4eeed2a SHA-1: 2f8e750691f932a05509b9d097a229f37b11ebcf SHA-256: 9a347722c56bcd92bb0c159707cd6d970cc2800d715682eb44ea95c39200dbaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being part of a link farm, with numerous URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the nature of the URLs and the detection results strongly suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/53809947129.pdf In PDF document text
    • http://alliance-ltd.com/userfiles/53331387079.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/9165350805.pdfIn PDF document text
    • http://redactron.com/userfiles/file/niniwamex.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/muruzifobe.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/fibibugogomokelalibeki.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97c76aa42---xevemax.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/90a09100d88dd35f215dd366b91349a9/mozakoditeneraso.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/rogafedojowoz.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808bc8c210b---55637377437.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q3gmsvrggk7cmup6ufeo8642hm/milisatibigesepisabajen.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/92470672218.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0d3508f412235a437fae2285f841df42/lipavigogobajolag.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796b6b5311---xekajisiroj.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/515e8ff555f292478a5af6e65691dbd9/16791341178.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b35c2b62e290f6c5d264c58cbdea21da/98636158096.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/gerawipirijaze.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/99cee1d41ec631a433034209ef25e025/pikamizatumupetarefinok.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/gadevejof.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/14679936907.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6kdpk3717bovkcmn3aancpg2f7/xewudakubuvobonoxe.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b35e6a1412---6194959108.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/53627263745.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/45886190602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=frigidaire+refrigerator+manual+downloadPDF 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_off0000b5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 10692 bytes
SHA-256: b07d8d9f7d36b6e7c91d700d0f618f709cf343484c06d928467ce05b48834774
font_02_sfnt_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 14224 bytes
SHA-256: 94b4e3979df3611cbf3579fa6582825206db4e75165a0e410f63fd7516a3c20b