Malicious PDF — malware analysis report

Static analysis result for SHA-256 1331a39dcd47f1b4…

MALICIOUS

PDF

119.2 KB Created: 2021-07-26 06:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54f3a18d1ed4e9be83c03c6af222d4c2 SHA-1: 694dafbb2685c39664217ce553e99fb6256a351f SHA-256: 1331a39dcd47f1b4bd7457c95fc919833210176507edd98ccf57713584faa60e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://etasystem.net/userfiles/files/39621900976.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/g86end8ua8ucmkb1uhllmf85ja/wabopigefor.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k8otc5aneuaipblpomue9brsqs/65992975491.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7246690272---lekavamefa.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/duwonanoderoja.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/fepilofagi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773e05bb0b7---nigul.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/21282182065.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/502c4377903cc05705fdcedd565f399f/28907124311.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/598a2aa66233763dfa98e8bd25263af5/87164265074.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/mobukapiradupeziw.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/pawomupetimafapenomu.pdfIn PDF document text
    • https://cecprint.com/images/file/28702713026.pdfIn PDF document text
    • http://darec.sk/files/files/razitored.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6342391f22---28991113721.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768481a38a1---10132410418.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/94047753538.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/mogipesoxunowit.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/suxoniketitumekurewe.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608287718d834---12647037663.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021052818153043.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/57377166408.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd94c4cc7---74222572451.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/bef0d98e9c0e66057ec861a359907f38/72972549874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+draw+a+cupcake+step+by+step+for+beginnersPDF 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_off00016d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18599 11272 bytes
SHA-256: 5c73b3b639568df8dbf544c195e5c5b0ac59bf9dc3a89a7c70b5066b2b675a29
font_02_sfnt_off00019fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FD0 17952 bytes
SHA-256: d6e1836902364db040f5dcd016afe238018eafd71f602a574ec4cb266671dd91

Open this report in the interactive analyzer, or submit your own file for analysis.