Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ebd102732128ac…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 15:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3cf16fa3e8a98d3cca186ab96ff86490 SHA-1: 3a0d74e871824dfacca1bdcebebb50c9662f00f7 SHA-256: 19ebd102732128ac95244fa44a652ab9370bb7b677f7819ea84617148259d250
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, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites, likely to serve further malicious content or phishing pages. The presence of numerous external URIs and a link farm structure strongly suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0bicm9i08tdqbhdvdo5bnv8l47/75767765687.pdf In PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/mrlrk2t0b1krbmrf80f4alp949/70365551499.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a6a56efec---rijikiguzekowibeduwevino.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/ditatu.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/mupur.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1124beb2---walare.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b45bde72dd---96165500582.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/797126772.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/c91vretkippm2vh9ds02sefmvc/78923364654.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f47a54fcb---tobonazabapegape.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/10554035426.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/68e736d5f306e104bad12c21eeef6bea/63143139088.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/sikijol.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ccf8b6fc---fofakupuvuro.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/daregunuwiwijojasafofupo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0f4330d964be128722ba848249a3127a/xolekilirekuxosofawer.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/52182739152.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108132116220082.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/bugif.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/xemutujobutoradut.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/jixunanalutogevok.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/kuposerujorikefomenadupo.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/xejatufinepisuvifelewe.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ae094241e786fde791c156f04cdc27c4/37091802748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wingstop+menu+pdfPDF 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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 18712 bytes
SHA-256: 9bbc4e2e99152ae9b42ae3239ae9bcf62fae48eadded636f807c382e9c4400f6
font_01_sfnt_off0001157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 10624 bytes
SHA-256: 12363ace03087fef927e4a079202d075402666e5461b81a460514619eabb1476
font_02_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1