Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5758c84d972b38e…

MALICIOUS

PDF

86.6 KB Created: 2021-08-21 09:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1234d00a2ce342eed765eb909fd06517 SHA-1: 681b3e341caec4796824723a8da7d2e89767f4e3 SHA-256: f5758c84d972b38e0e0a4f0ba73167f09cc21d86ac1213410320c0baea19a401
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised CMS uploads or disposable hosting. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination and potentially evade detection. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=how+to+use+tommee+tippee+bottle+warmer+instructions PDF link annotation
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/51679264485.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///menubudogolapufomikopad.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0efc632aec---1240526473.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160701153449b1---bejutewuzubasemisele.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e0f990d2b745bf3c554be3a3cf7d33e7/midujowexofud.pdfIn PDF document text
    • https://cowik.pl/upload/11241322660.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/mizojizasixarebedatafo.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/28581798480.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/35616157769.pdfIn PDF document text
    • https://scriptdd.com/_file/file/vesitot.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d10c1f10255b8179dfcc8c5c1d9a371d/doribimumuduwewozepuw.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/50157707622.pdfIn PDF document text
    • http://progetec.org/userfiles/files/zibonoxikowegutogevoloje.pdfIn PDF document text
    • https://paperland.bg/uploads/file/6353835154.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b80d3a9c---72604647601.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2e02b96504fd54d4ccebc0dd990eae14/14775802309.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/levaxepegedulojukaniku.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/18858711505.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-20/20210820110359555342.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jijuwofurogiwepewebit.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea09668a9a---68176967276.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 10852 bytes
SHA-256: 0e94a896eec5a507b3c7b10e4606a7c2c8c9f7e7689c233ff6f11eba8a270882
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 17820 bytes
SHA-256: 170dd30c3cbce18887bd78f8add79677f8a784eba233e687b86650c4c4324b9f

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