Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d348f25b287592…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 14:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ed945f8dc49ec1d6cdd54d2ff41277b SHA-1: b3487d147113c41ec4dfe31b68af2101bdb600a0 SHA-256: e1d348f25b28759292a5f528601c72c68ecf0924184f9e50f2aadec72d1989a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://topjobsnepal.com/ckfinder/userfiles/files/rizoson.pdf In PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a988b6962b5766f9310320e481f88548/91146853040.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/diposotijoxufokexopibo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e327bd1c65f8fbfdca354d14b59ee703/68888641717.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nufuvonarotomoxut.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/37556661055.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/zuxinerivanu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9e3e944e6253140fafd3cb883df3cd1b/luwelukopuvunu.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/fusinereromijozuv.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713bc28f8a1---63885998322.pdfIn PDF document text
    • http://liyangah.com/Upload/file/sukogovipedakoda.pdfIn PDF document text
    • http://jarosi.hu/files/file/movuvudejagozax.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/bowimevar.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/14972897419.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/32103582373.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/17323691710.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/45583511710.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/37545963729.pdfIn PDF document text
    • https://themalc.org/files/file/44351531390.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/1971822522.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/tupimewup.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/24474803031.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210829140314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=continents+map+worksheetsPDF link annotation
    • 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_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 18300 bytes
SHA-256: b15a31c5acba4c531b13c1d685833d59b70a6976524fb6523bf52f63e3842968
font_01_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 10680 bytes
SHA-256: 70ba93b85d3f8059abb275bb6c972ae297343998f0cd65fb29a54b2cc62e9c56

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