Malicious PDF — malware analysis report

Static analysis result for SHA-256 6436df901eed905e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 07:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12655286f1e9f985f36e47db3ae0a114 SHA-1: bb7cedeca75a6570c591468728e6b45caa56fa66 SHA-256: 6436df901eed905e553ef5fdd8a60b8379c8997ff2545f5e4bfaf52c75aa519e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e957688b1d---nubizuneposuvewonopuvinut.pdf and http://elitacasa.it/images/file/jusuloju.pdf, are indicative of this tactic. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://elitacasa.it/images/file/jusuloju.pdf In PDF document text
    • https://jagamimpi.net/contents/files/35136554323.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/zabikufefapameda.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613726314a7bf---90050039307.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/gojorasoxofoxeputonisewo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/94741855319.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613211670b6ab---38923067237.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/3127776595.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/46232573595.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/23617396432.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136428ef084d---44471417084.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/rezije.pdfIn PDF document text
    • https://tivicom.vn/upload/files/60077228309.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/8728447593.pdfIn PDF document text
    • http://ihdbd.org/upload/files/neniwelibanadudapiwunubo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e957688b1d---nubizuneposuvewonopuvinut.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/pubexikezukonepefigajim.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/49026704328.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/fomozapebidedemowiloje.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/tunafutamiligepumotibina.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/abcaf9c5a38bc41b6dc7833dab3317ad/82941085676.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/fekakewigakel.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/577486845.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/fuvutukesarudabuk.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/4655221621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+phone+not+receiving+callsPDF 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_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 17264 bytes
SHA-256: ec88312c4e362cfb86d97386d810a2244c2f3b20549d38c7960afeff6769c1e1
font_02_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 10840 bytes
SHA-256: 5c6cd309c0e92246484ac72ae981b7047bdd805051b4559e5677ae209ccbb8af