Malicious PDF — malware analysis report

Static analysis result for SHA-256 27667dec42be44da…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 18:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 038f65261b6f94a54e00bf27be2a291f SHA-1: 2d3d7d0809841105248e89f6f0ea829163d1cee8 SHA-256: 27667dec42be44da310e8c455697e7bff048da86a18ed780cbb339abda5faea3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=pocket+army+mod+apk PDF link annotation
    • http://rafaelokazakov.com/file/lalozesezazedipup.pdfIn PDF document text
    • http://pedraferro.com/files/files/xelerakesogoduri.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/59280436687.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/62526781016.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/futafavogavekofuxene.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/wadinemasinex.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/88995124851.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/tuvaveko.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/feturomubasololimune.pdfIn PDF document text
    • http://secretinvitation.net/images/files/jugidifobufibavokefik.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b469f3c27c---84113772392.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/81192874871.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161302784d1381---xanusadatolufewesogim.pdfIn PDF document text
    • http://strahyi.ru/images/file/12121153305.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/78481002855.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613551724aa8d---80212456261.pdfIn PDF document text
    • https://airbays.com/userfiles/file/56755875974.pdfIn PDF document text
    • http://serting.eu/userfiles/files/gevudaxuvuk.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/lunetuwibijuwel.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/5881424765.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8fed54b73---358712848.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/jilarideseweleril.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/givevupax.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/89976622128.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/18576560696.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/rulonunekobu.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_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 17960 bytes
SHA-256: 4c0ef5c6e77abccd0a6eed7dbd5fad8fe05be16bb7e5d41603988504133ebcf9
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 10472 bytes
SHA-256: 154ec35ff256dced5b8c48fc0c1fe16c666a7b5512a7ad445307a388345956aa