Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2d7f012b90566d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 21:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27abc07ba8fd7f9a98fb4d464576f31d SHA-1: 7c6392b0897fbd29d1dbe7a86a182a63239b68e2 SHA-256: dd2d7f012b90566d52dc3dfb58fb1e76b75bce1d3c977775d677bd9912a5abcf
176 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content, likely for downloading further payloads or engaging in phishing activities.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=powerdirector+premium+apk+free+download PDF link annotation
    • http://yasairamenbar.com/uploads/files/miveri.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/90648803203.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161350c93d6d99---52813089916.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/kuxutekupibaz.pdfIn PDF document text
    • http://webs123.com/userfiles/file/pagenoniw.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/kawepazuju.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/69793373146.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/dewefogemilobop.pdfIn PDF document text
    • http://nktrading.qa/file/files/96044548747.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/sutaderosun.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/popewulakap.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/zurutojumobaf.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/vumokokax.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/raxijodirekare.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/43387466284.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/41671819830.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/3374578909.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/83974328201.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/2486493247.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c947514daf---35050149636.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b6aee8dcaa3084a151f007d343a9799c/lisamo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/17765329559.pdfIn PDF document text
    • http://redactron.com/userfiles/file/63680708400.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/xugepegusilerizagulasutex.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_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 10892 bytes
SHA-256: f15230bb2c2c926e6c2ba030d949a062316978bd4af03b0bcbee55fe20842633
font_01_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 17408 bytes
SHA-256: a97c128dd391bcc2b52a05e7e885682f38bac5792fb0209c2c71c130041c7ed0
font_02_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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