Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e6a47421d6ff77…

MALICIOUS

PDF

87.8 KB Created: 2021-07-08 04:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ea34d89bb276438731dfd7dc74e259d SHA-1: bb4e0ac33bc6fbdc8848389fe027a2525efd0471 SHA-256: e9e6a47421d6ff770318642829e6c472bb4feaf0644bde99465dea70027c2fac
184 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of link farms pointing to compromised WordPress uploads and a callback lure, suggesting a phishing or tech-support scam. The document likely aims to trick the user into downloading a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • 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.
  • 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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070631980eff---silare.pdf In PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/fcum375ocmaabb7n5qoi6la455/87314534769.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883775d956e---nugigelezafefoz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e99f15aef---nofetimesonezin.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b59abf91424---rorivibenemov.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/83984644186.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad6ceae41---60549744644.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/70728191680.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8urb219hjgam5rnn876pc325oo/wakazuvabukaxuwox.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/xijazefisip.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/51176757303.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c909303abe4---76705651649.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/pugitog.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070684d2f056---tajoji.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/o74h49debfa9ggumgg79q89ri6/66455038644.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/50b61a2e0bc0dc0aa49a855f7468db81/43437892815.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/922a274ad48208549940ba1c4dc1cb67/99787802963.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9910ac262---tajudufabepukasemoju.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/mepuferitefadoxetafode.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e675f72109e1bdbb39df6013fbc1a229/zokudomoxeporure.pdfIn PDF document text
    • https://turbooto.vn/upload/files/fojowanabaxevunenegew.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/38646709756.pdfIn PDF document text
    • https://service-panev.com/userfiles/1938466492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+an+email+as+pdfPDF 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_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 17508 bytes
SHA-256: d69d45f6e0caf959a736c80e752c1c0491da965ced5e2ef31d4f9dd3a24af634
font_02_sfnt_off000139f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F4 10548 bytes
SHA-256: 6b7681d5b6260e24a0222f3953bf35490e733757f592461f3a76bbbaee86e128

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