Malicious PDF — malware analysis report

Static analysis result for SHA-256 88140c083eeb26d4…

MALICIOUS

PDF

123.8 KB Created: 2021-09-01 06:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1873ec98d51fc1a62718211c81f5c2a2 SHA-1: 9dc8d7b76be2afaf0a68ff37ce395ac9517484fa SHA-256: 88140c083eeb26d4dc1381eb2f2c585fcfe06394569a5b35fdaf7fd55793c319
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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://styliststudios.com/imagesTE/file/87855788320.pdf In PDF document text
    • http://rayer.cn/d/files/dutekanikil.pdfIn PDF document text
    • https://taperagi.com/contents//files/wetixisusurajawipuzuxuzu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c57976f54---ripijamajorepisirutesovav.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/9d50e5f64f37bece70cf7b32387b1561/wilarugugopud.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb4f832a88---dopobiwoteburaz.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/78123970619.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e491883f---xurobifodimatazijamuvema.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/rikelopetizenodofoje.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ad431339---relirokiporimagi.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/bebasopizajaxekezujasi.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/lewekazexupid.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0q41l3ua1jrm1f1vurq122s327/tewepokizovako.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/bimetufosedesomiko.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/iom7o4435v1hbjsv25sccnnb1v/19518108791.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/6vacunp87r2pn7uvtk1nttiso3/93218522583.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/53501223543.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/tabegobetew.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/dejesafonarunisezol.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610e45360165f---75526748056.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/29613029858.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607636e809188---32245395484.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5900170019cd6d149b6e848ec3492d47/30069771368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+old+man+and+the+medal+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_off000181c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181C0 10368 bytes
SHA-256: d4b411da6b1b59edc90c0ef41740094dceb09f631260e849cb134397f5263eee
font_01_sfnt_off000198f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198F9 18828 bytes
SHA-256: 38cdbfbc6797d121ed0b2fa35de7c3d08128a354908eb0cbc20ae85a84d7446f
font_02_sfnt_off0001c99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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