Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61066e267c92909…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 05:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53f92c29325389f09907e0ea44463817 SHA-1: 0df97bcbcc3da521d4b1a9611e18ea3b41c06e61 SHA-256: a61066e267c929092024e3633181bd504a2a8f591b33832f42fa839eb3b42323
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests it's intended to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/66dea562a8c2780a356670600e3274f6/68962841749.pdf In PDF document text
    • http://sdes.in/uploads/38920733858.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f874772b57b---taxesaladasiwo.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202108150610163262.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/3eddbface19a26e961a6836eb23514e1/65325100076.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/49330c278372c874e896cd354c9b1148/jajedoni.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b64dc61e675---26482753104.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d380f374ced---42970042083.pdfIn PDF document text
    • http://suara.ru/img/file/82759051100.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609417c9637fe---48483676575.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/fodotuvaletonemekotuzij.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/13975814051.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1827cce439---pubarigijovotowubomex.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/44695195635.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b2e6d4fe5be67af6e1f7c90d40196acf/larikovinemezavatokis.pdfIn PDF document text
    • http://dentherapia.hu/files/file/10264369668.pdfIn PDF document text
    • http://xycrusher.com/d/files/burelot.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bj0e58ephnj0bhju1untrbrad5/rowogonowopejirovug.pdfIn PDF document text
    • http://aweibel.com/Photo/file/kugigozetiribut.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/raxazibepakatebabaze.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eac8ab2c841a52aec33550ac809c94ce/jevuzase.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vevugenobok.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/judedakajafokatare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rgb+color+chart+for+printingPDF 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_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 10644 bytes
SHA-256: 4f8a8a330f291a724780f5ac4f4ca56886a525f3de2a82b12d6dff78858b6120
font_02_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 17556 bytes
SHA-256: 44183e255d5ac484538a64fc64e49289a403e96276ad0db081a76bf09165f743

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