Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2a9df91f2fa723…

MALICIOUS

PDF

94.2 KB Created: 2021-09-03 22:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d3b156024057efbcd3cd23d36f568b3 SHA-1: 0027b766c511559978c6a0cc616c21f3e03c5c19 SHA-256: 1a2a9df91f2fa723dabcae11da766965caad78a1d1d8e7940cb1037203e2a9c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple links to compromised CMS upload storage suggests a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to trick users into downloading a secondary payload, likely through a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9cb8983a0---41432125741.pdf In PDF document text
    • http://nprofit.hk/userfiles/59501664259.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8cb9597d6c774dd7043da67f193b9466/74752385588.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/t3lkkdq55b9is0bqulnqc9cnn4/majotujagefim.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/pinulogefizudodij.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e955add13---fizusutuxewemomokunigeri.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50440302034.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f21155ce---21609989487.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16124ea47a0ddc---kovijil.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210623214826.pdfIn PDF document text
    • http://envigest.cz/upload/file/39364815424.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/69659aeff50cc9eaa5dd41ff8088c343/mukabigafotolofativavilem.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbab03aba3---17518974598.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/30609382252.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc3d16ebd---43046691866.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/65964901133.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/86073964485.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4990e0d341f24d6087130ab446a2cb21/vekeguloz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f0cf7628f3b---31954923525.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/nuvafirefokatiduxu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4f9efe1dc844d83c2ba9308dd83ad506/lebin.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/jk42egt593afr74hovr51795l3/wedufipupapojodugiketil.pdfIn PDF document text
    • https://clove7.com/userfiles/file/loligovoxaj.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8441736766.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/psdnme1m1nbvgj7002cfou106a/79964257780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bompani+gas+oven+user+manualPDF 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_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12511 17396 bytes
SHA-256: 730891ec7237c1cdeee36ccb4c619154286784359da4d70f8c810a272fd77505
font_02_sfnt_off00015246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15246 10716 bytes
SHA-256: c6585b42cf0ea44ae0c5c66f85918af476e046e5201c2cece746c2e078053d90

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