Malicious PDF — malware analysis report

Static analysis result for SHA-256 506aee44f14455c5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 22:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a02b34a869226f4facaffba2fddbe5b1 SHA-1: 2cbcd0a676bd115a165dd9a902cc88330c71fb20 SHA-256: 506aee44f14455c58f20735a1c825912bbf10080fa51da9c33f614d1202d435b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://oilbasaro.com/web/images/ckfinder/files/20210901193407.pdf In PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/edigvrj2dkcqlddiajqgdt466p/siwudojolojadime.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/97209967576.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/kezitesigexitorojamilixig.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0bba12db---64940530661.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9c4f874cbd81ef0a871bf6464b82eb20/84818890426.pdfIn PDF document text
    • http://lamay.de/userfiles/file/73527845386.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89b778bf6---26344944205.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/57e6a4f63a73afe2d1dba42a6191ca8d/62153972031.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/neraja.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/26243545322.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1629709278.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/dotazawegifikon.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/67800874017.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e11b528138e0351443fe46e7c148845d/62582264785.pdfIn PDF document text
    • http://18554080.com/userfiles/file/xumidataju.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/60ba1ad36202558f65f6e675ec6c427e/37007691989.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/82612631856.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b197574781d---lonixobudobiwovoriwa.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5ab8285ad96454709aff867396e1dad/fulolu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/judonivajijoj.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/eef10412f85b0cfcf96d46043bb96536/59620810394.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ba8e37458---75051469837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=oligonucleotide+synthesis+market+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_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 11400 bytes
SHA-256: 826290165e42bb4cef7316f5a5158de587bce30b28df4b25194242a7f24eece5
font_01_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 17596 bytes
SHA-256: ee7768c2acaaa88d89c7b70297f88fc60348282994b4ab089d71d65a1862bcb9
font_02_sfnt_off000127a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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