Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac77aa8a4067535…

MALICIOUS

PDF

97.5 KB Created: 2021-06-28 02:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: af866dd9adf17919a7e7f288a4178eca SHA-1: 7c9a2a8b9f61adb03b0297fc0e66239d0f3957a3 SHA-256: 5ac77aa8a4067535e5da482955907d94e1c749b770046f36e5acdd789c3449b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/lcp87aenrk0f089k4h00rj00tt/povaxa.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cbc6e3a211b18d99f7993c022084451f/31200811499.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80accdcaa---letiximoxidagoj.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/106020b037bd92351db61475813595d9/70406239653.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/67455124543.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5e9b6758ad7ae80b9076fc7a63d67598/76758501962.pdfIn PDF document text
    • http://lg-palette.com/upload/files/fokolobewepi.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/84936306407.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/d3oejmeu3iiubj4nh3qeqtkqso/dewiwotijokitewaf.pdfIn PDF document text
    • http://jar-ted.pl/file/88078854083.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff2d32667---70639108932.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/finuj.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/68366802646.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/45959213048.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e36dc20224359fbb3cdabfc8971e903e/bejiwodixibezezaxi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070332f4e1c0.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c502bf1385b---telavofaxejakexidewomiz.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9uhccm1b78a1j80bjkh1difmf0/17948971867.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983b6c065de---89584609696.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c985ab7c40b---wuxerixidadinevurilizawe.pdfIn PDF document text
    • https://yallaformation.com/uploads/files/sutaruroradagaf.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160838e0c32c6f---kupikepevodirijinifep.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/0f2bd76f04935602d2d9bb543fa3e310/zizop.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a050d737d73---63622605618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=raga+for+peace+of+mindPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/xuvibavaxolomibiwubomatef.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_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13313 10696 bytes
SHA-256: e2869991e02c33ac551a9980542f28d69f7972aa97730e3b128e64977d9f8eaa
font_02_sfnt_off00014b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B53 17700 bytes
SHA-256: ec5a70cf855ee9fc42d198091729021ae23c8e73336027a54fb8fff29544517e