Malicious PDF — malware analysis report

Static analysis result for SHA-256 778dc1955c480dde…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 13:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d521b98ea20a79d6210a99ee59552a60 SHA-1: 2902db58cc8e7a5edd54ffa40294575d8efb9d81 SHA-256: 778dc1955c480dde991c2b397cf24afb93af445582332caaa584f13c1a3f544f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the nature of the URLs and the heuristics suggest the PDF is likely used to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=premam+torrent+download PDF link annotation
    • http://sklepjola.pl/userfiles/file/47015522337.pdfIn PDF document text
    • http://sro52.ru/uploads/files/58513829922.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/wimof.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/28536421084.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/dovinaxijasezuxiromo.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/luveboxudipebavuwezeku.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/23991852040.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/76365359776.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/46351601707.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/siwadoxadarorujufom.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/zanezeparumi.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/37273312018.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/53839528374.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/21994808243.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/jetafodepulibonapa.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/52268935428.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/66175985617.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/o3ggjbqhea7rcf7odchallv3gj/ruvolaler.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/18956001461.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/41155125483.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4daf734fc47aa52f2f3100dbf87cf50e/29958220430.pdfIn PDF document text
    • https://parfumzone.ro/files/file/1536926814.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd65d375f8---fufapad.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/96013166975.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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 10236 bytes
SHA-256: 8aeb140706630fbc6e0504f9a13775814060de8c9172178be54c13fd5c28407b
font_02_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 19244 bytes
SHA-256: e300fbd0a6499230ba628be6dcd46a9c8acde953a55d0a07cc5dd1e8c40f697c

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