Malicious PDF — malware analysis report

Static analysis result for SHA-256 182a19686af16cf3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 08:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc0ae5429e26168611a64a30ad162110 SHA-1: 56db01da930e7663cad91397dc2a99b0140a447a SHA-256: 182a19686af16cf351859e23c7c299b0e0f0bca1fc92247016f48ea31d22f3e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites hosting further PDFs, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://travelshops.pl/userfiles/file/xoruxasalabaxisowug.pdf In PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/fuvivomaxa.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/56558be9a02f2179bb23cd0c63640800/19176123232.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a8bbd731525d110d3d3d30ecfbeae42d/69603487512.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c30b7beb---28711633626.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8mr1a1kv9nu4tfccflp8lir5du/taselopadi.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/povagose.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/fe4e2dddbba7e7a95dcbc9965b4ebe25/1041684798.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/ab406f6edf8adeda291063eef3283482/54382053402.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/58206682866.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7fd830ec---tevod.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/25659159378.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/jonorofogajavidaxazije.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/22854034608.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/44a02f69d5a27ea7d1edce58b2f25598/84921119031.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/52196254691.pdfIn PDF document text
    • http://kleiberit.ru/files/file/35255227090.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/diwati.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19915300179.pdfIn PDF document text
    • http://eventechsite.com/files/files/zepodewexol.pdfIn PDF document text
    • https://dacola.com/upload/files/7614634526.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/tifosafukinigezik.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0p1te0h02pd8pd9cqv8j0e60bn/47181278544.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/pisagirateti.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611087edbe586---64467086934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wix+link+to+documentPDF 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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 18408 bytes
SHA-256: 985fc47743115bbe9a111e2c5f8788976d3a90be7e2b34cb51f9ec9063a74c9b
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 10388 bytes
SHA-256: fa4f7f689bdec0b40ab26d4f2ed5284f3fb5cff463e0051c3476974ad03b2967