Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a90f687066f3a39…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 12:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cb180406b527b79fbbdbeb949c195cf7 SHA-1: 118ee5373650c44adcc3702e39c0e92f1fc45aec SHA-256: 1a90f687066f3a39b87d61cd1209c02fb8a4ee2ba5d2075bb9a803d86306bd62
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a deceptive download button and numerous external links, many pointing to PDFs hosted on potentially compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The primary goal appears to be luring users to click links that likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://crewmak.ru/uplcv?utm_term=renewable+sources+of+energy+vijayaraghavan+pdf+free+download PDF link annotation
    • http://jpind.pl/userfiles/file/48753603524.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/ziretuwodofot.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/p42jm0j1i6913fecmagpbhf8g2/61800299950.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136141ea28bd---xojoteginirowumazi.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/kasofulegutat.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/89773946791.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/84786751704.pdfIn PDF document text
    • http://elsped.hu/files/file/zesijopos.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/7725235893.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/ganuduxamaboj.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/gakerudifeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082e2ce790---33494315959.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/livudamavudekozekosuzites.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/supipiwekigol.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/gojizozobe.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/dupiremutoximanalajelix.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/vasajuzanobubijesabamono.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/49357104816.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109081656159839.pdfIn PDF document text
    • http://regcureguide.com/files/files/39385312046.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_off0000dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 11480 bytes
SHA-256: 802bda7fe335109850c5586a318e4ae2ac5956f309c2492cfaada67379ad555e
font_02_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 18792 bytes
SHA-256: a2f6773333e22a789e678061a17f021917e854cd4eca9234a6e2e52e5071ed00