Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc4087711a98e6c…

MALICIOUS

PDF

82.2 KB Created: 2021-06-30 10:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5aee3d22f6b3f2df940792b051fc795c SHA-1: 356f9a47a2b8cef062a016f9cbe0561d44fd2ddb SHA-256: 3cc4087711a98e6c0cfda76d0486d9a39cc8430b772bdb0782e48febd9cdf737
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or SEO-abused content hosted on these compromised platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://www.lebedosapartotel.com/data/yukle/files/getewupisuferezesirimir.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e2138eb4---72986159799.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3db7f2b8a---nabifuzejasomefososorex.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/gutobowanipaz.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/aa5f7c252fa08c391dcf9c303d219647/zoxifibunimadorikub.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9k8cj1rafcii82uq0sblbi9nuv/rubulumugul.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b365e5be451---rezuwekevukurozadidowuki.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ec8f77a0a---xetubipaxereg.pdfIn PDF document text
    • https://btegypt.comfile/vafemifevif.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/a2028aa0a7edbf5f8cdd05b01dc80bf9/tozufaxun.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5e3014dc---wafudexuko.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7facf05c41d2045bf7dd2d95bb60eea3/jokaseritazidib.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096289bd3220---zudewigopozevimomu.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210619065012.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee523cdc37---66161121700.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd6b3ba534---80025766227.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4b5726893ec2034d86deb8fd1729324a/87843953542.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607082b486227---93539028257.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a195905d4a9---17849959772.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/18500596528.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b1badd99d9239ab471f56c0368d3176d/26171053558.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/nejosisedik.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b75cca5b396---rasumufasokumokis.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d4da837d---72675781964.pdfIn PDF document text
    • http://metapolar.hu/tmp/48633217175.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b919bbeb428---53447373265.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/20/file/20210520_234122_177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mosby%27s+medical+dictionary+pdf+free+downloadPDF 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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 16928 bytes
SHA-256: b96b1a02e6bab30287ff32f2b31dabfd198a7022acdb24f0f25d72c77c700c29
font_01_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 11148 bytes
SHA-256: f9b6264f511dac2cf54bfca743375466c480c773cc5d930e0d69f7e027c355df
font_02_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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