Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a070160eb53a2c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 17:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa434ce6dab5bbdca995d51dab13d418 SHA-1: 87dfcd6c90c676b5f4e566180cf983a2c25a9346 SHA-256: f2a070160eb53a2cebcedaf875ac9d606f9846794eb1633ba1cb30e250620ea3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bevasilicones.in/userfiles/file/xenogadotidupamakew.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139defb3a30b---56903616624.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/10228620398.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/xirifowonoz.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613104d9e5e36---92028139917.pdfIn PDF document text
    • http://kasargod.net/uploads/file/58168484302.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/miluwevesuwakajukerip.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131482f7f0ec---80704788715.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210906101955_aaps2o.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/6453693824.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909175504270218.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/bosapetazorizokufomufiwet.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021941959327845.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/75682422371.pdfPDF link annotation
    • https://www.profiemg.cz/upload/ck/files/26870437114.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130595618d19---45681197025.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/gemuladinafudabomobupesi.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/datutosumax.pdfIn PDF document text
    • https://noventa.cz/media/files/file/wimegalasikuzamo.pdfIn PDF document text
    • http://grotech.in/userfiles/file/48276281065.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/66231154917.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9487e29f---zilopareneweperasasuvas.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/66965359550.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0bfe6eaa0---27103596174.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/vutefomadabetasawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=set+emergency+contact+androidPDF 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_off0000d1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 21016 bytes
SHA-256: 51e5ed4e6dc6d2b380c03c6d44dd22acd94eaf74f817d89477575d358b755b29
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 10688 bytes
SHA-256: 3145d9fe25270638ba83b0c63112c77c0d27771f1f3acd9002af145984022419

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