Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55f6ae1cc14f3a4…

MALICIOUS

PDF

104.7 KB Created: 2021-07-22 23:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0ef1a02461cf3450ed9be9fd2a642070 SHA-1: 23c28da815a4a32639051e78ba0093d63348bda0 SHA-256: d55f6ae1cc14f3a4fdec4f559b3590c1a66e24f048472bfbb884e5960382c884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself does not contain executable scripts, but its primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb51c89b38d---paxosusifisisuvotago.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c1469ffd---22885476375.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/19558357628.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31db17e2c---48699414082.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/lofamukob.pdfIn PDF document text
    • http://4bx.pl/public/file/xawiwowivawexipeki.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/96347431934.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1472742693609cb7331d40d.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/80615613699.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/0f4buqonfgj9e2ppl9qg7hf8g4/towotagexa.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d3651bbae---18629090304.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c091d4d4bcd---jiwexebenovexobuz.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/pulepiwavuze.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd92903a74c---buturevodat.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/gregevrkcc893s16nqnk7rve6r/40657430052.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55533661921.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/sipopegulawejesibiradem.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c995f1a08e0---funexekisuvelazimatiwalaj.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f59f15367705c9b65a5220bd62fbf03e/temegopijofid.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/89055808381.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/3073491457.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/gajisu.pdfIn PDF document text
    • https://cncunse.com/d/files/vofiwefafidusokufejow.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c2608ef081c61ab24efd2393393b6f83/65887899994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=example+of+ecological+species+conceptPDF 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_off000137e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFE 10808 bytes
SHA-256: 140c2a19d6dfa7e5e06dce0a183c2301b955b5af47a30838d20eb4fdf897a891
font_02_sfnt_off000168e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E9 16532 bytes
SHA-256: 2344ab92d93cdbc2fce7b5767fdd79e0e7408f2e171d0af77587791784dd362d

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