Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e15b867c9ad1c8…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 07:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c460a205ebd07f4f29a7768f64748907 SHA-1: f9550cbdc0805009e3d97cb8be1dfc2215e67b20 SHA-256: a9e15b867c9ad1c863b7661176d02a16d5cff640748b44829c3dfdf96f5c15a0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://asupuro.com/user_data/image//file/6827280848.pdf In PDF document text
    • https://bselink.com/userfiles/file/46336950146.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/6064747184.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/oadkvkg0kh3k6io4r9gsv5aqfd/nojara.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b42e4f452---vilunopufofez.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/xinevinas.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/254011e0f94ab4082f811985c3870371/vunubifezewekejol.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/h98lcqhbetcer3k7628od94or2/mojabapelamusitenove.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608340ec11873---kimafezafefaxapopalobi.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/96778969990.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c1769b29---zidosezaxevojupov.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b457c74da3bf13322a93b88333dcbc89/12572134830.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/974c471f9f75a4fb7f7fd9e610978e00/bumomagubuvidu.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/pigowaxep.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/34240829045.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/63419662678.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/nakevaxapumekazotaji.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b13da5d768---dadizonedibodifexod.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/44888436250.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/38jm59k4b6sfsr3uef1mtgcn1q/voralosipuwelubelawexip.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/xidematesojunusinubelata.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210614_F1FD188016A227D7.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/23198975729.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2ab244fd---56323048746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=guy%27s+burger+jointPDF 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_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 18304 bytes
SHA-256: 3601c7b2534fabc96772cf28a93d316c5440ef63950d2ed513a0465f1ed026e6
font_01_sfnt_off00012d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 10632 bytes
SHA-256: 92247424069d81524af82aba721f6b5fe48485cdc72c4f3e672b64fb94ee1dd6
font_02_sfnt_off00014620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1