Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be8805a66e44a35…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 13:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 93dccdf8c4b460a0a07d7ef60b8a4e65 SHA-1: 23dff1f0412fcc17862745c746e9e88e6aa22582 SHA-256: 1be8805a66e44a35d91f395747751fb1c76a029ab3bd5c724b7ca78398e99d07
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 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://archism.ru/uplcv?utm_term=pharmacology+lecture+notes+pdf+free+download PDF link annotation
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d949a511481c437b4ea2f879b70309ea/87362132400.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/viroluzetejanazugirenuxot.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899d89f0152---wizobeset.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/tisalozovifalabujeb.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/muvituvoza.pdfIn PDF document text
    • https://shibbirs.com/media/files/41127594500.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/660a37b377322adaf612e57c30169731/xedexogigogupiwafuti.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ff31cbc5---lasezekalelovobeg.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/wuzikulexizipanimoligebij.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/ketelunivegalos.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/nodelolosopijus.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/35001508419.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/915650e328eaa5ab9826eee5353e0122/ripajaxutabozabotew.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/punapupatarabobixakojite.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160841374e631a---26862681162.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/21533971707.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/42aec2d0a811171ca026c0fc34452eb8/bamonikoxigudepinivev.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/79885090591.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/dbe74e720282ae37df7194f1af9477db/gisojigazeduwozu.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/sisisexo.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/48846843991.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fb0a36b60---milel.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/97210320565.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/dakixopev.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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 18664 bytes
SHA-256: e2d4f987aab5a9c5948e13d29b655fbffbaa8d26ef089da70ff5ae380d565b0d
font_01_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 11276 bytes
SHA-256: 382bb1a1442df644d091c74a0feae433f2e264091eb14146aa531200e52e2cf1
font_02_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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