Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80c590f87ee71c1…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 15:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4251668e30412dc33caa800125507fd5 SHA-1: 926758be756e3fcf3f8cf6d98cc3d0873ade63ea SHA-256: f80c590f87ee71c186054d50d5b0230d4965d113ef2f6ecd92003ce3704776e6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm. The presence of `utm_term` parameters in some URLs indicates a phishing or spamming campaign aimed at driving traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://oniceh.ru/uplcv?utm_term=payback+game+apk+download PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615609568922e---47835345811.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/44301002224.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/robuzefugopuvezumifovari.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/22180149648.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/jawenazimuf.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/13537798243.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a14493596---97134887364.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/72667407754.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/2311929069.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/xetetatasotokoxujojura.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/sisoxexoxusolafekumono.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aad91249f2---gezuxijisejeduxufuribekax.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a181007c---xobizorelusep.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/94304730281.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/vaxupenizovufes.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161349d53e59ae---81842175924.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/56524838767.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/97590528470.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/maxowebaxabiriwileziwewuf.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/lonepiveri.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/8506275077.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/pegurimakibonudigadani.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/58363838586.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/zofimosesulad.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/solixivejage.pdfIn PDF document text
    • https://krossi.ru/images/content/files/14259402093.pdfIn PDF document text
    • https://vpmemorial.net/images/file/sakegoralenujewonigeti.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_off0000b57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57D 10832 bytes
SHA-256: 875df7285f6b57313c8854d754b9b2e277a3cf84c5cc76986192283935c4e023
font_01_sfnt_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 16404 bytes
SHA-256: 8af2d9082ea21363b725284cfbfd37832ba2b4e004472f40456ca2369d34aa59
font_02_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1