Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2aafc252d773ee…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 03:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 024260458c4d1f3cccca481fbad76f9c SHA-1: 9561e04d5d39423863688437b79cd6b20829e383 SHA-256: 4d2aafc252d773ee4f80f3f5baf2a8074c75d4cf11cfd33d23dd73dead320086
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to various websites, some of which appear to be compromised CMS uploads. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain obfuscated commands or paths, further indicating malicious intent. The primary function appears to be directing users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://inwebjor.ru/uplcv?utm_term=is+spinach+iron+rich PDF link annotation
    • https://investincarpathians.eu/app/webroot/media/files/72985799459.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/nutinizavumigob.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/11583610667.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/24805932483.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p0d2cmdu40b41n5m6nptkmeql4/rozawakezawex.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/63916235691.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/zajedikisamemogufenimiw.pdfIn macro / runtime command snippet
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134368eece94---28583383908.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132537fc9646---nugew.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/40211941621.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109041226127899.pdfIn PDF document text
    • https://aksusu.com/upload/files/8220393320.pdfIn PDF document text
    • https://kar360.com/resimler/files/vukuzumovukabixufogabaw.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/newasusokitasenil.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/1164e85bfc1e0d8ee0a92359463d8102/ziposuf.pdfIn PDF document text
    • https://brukspec.pl/upload/file/28617092536.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d3bbc209eef19dce4ca3b64d26e6068f/4593231741.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614261ee6d768---kaxekelagijusewereti.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/zakuranomap.pdfIn PDF document text
    • https://ebooksweb.net/files/file/moruda.pdfIn PDF document text
    • https://ms02bet.net/contents/files/kutudibexelenure.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/donaxixogujivavipojo.pdfIn PDF document text
    • http://confidenzacsIn macro / runtime command snippet
    • 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_off0000ba8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 10148 bytes
SHA-256: 4352c248cd0a7d7b698a45fd1235399bf754d2a55d92ac031047e2033cde4aee
font_02_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 18200 bytes
SHA-256: eeb9cc4542ab2253e99922b8129e65ff48339463c21b0f2841feb670b517fb45

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