Malicious PDF — malware analysis report

Static analysis result for SHA-256 1566f6c5e5956fe6…

MALICIOUS

PDF

70.7 KB Created: 2021-08-06 16:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 927c8a3f2acceb1c26f50ade672e609f SHA-1: 28fa927debc927d22064dbdc21855309a21b1913 SHA-256: 1566f6c5e5956fe6582d5c4971d43ebf09243261d5003f8cf11b7b31515b5604
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing campaigns. The document body is heavily obfuscated and unreadable, indicating it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3323

Heuristics 5

  • 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
  • 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://aashianarealty.com/file/zivopevatenofunuxekoma.pdf In PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085515f532ed---gisugabo.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/207861809060a95b088a5e6.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/kikoz.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/wewezuxezuf.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/28440704631.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k50hla66okc4hnma90b90gvee0/namufiluvodajufoveliba.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcec2cbc3---73486561385.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0522af1ded---barudafumumofojuwofagivi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092712ce29f8---xobovevabuganuje.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b77168cd466---58246316439.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/novozifukonilewadu.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/binim.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/megeti.pdfIn PDF document text
    • https://baglab.pl/galeria/file/81081889952.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/88863301690.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/86229046978.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/e042p0fkecl74o1iomeko1ers7/37428559878.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a12a430c5---63480431482.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092968c58f7a---73448360656.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/18783996009.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f400399d3510e24458a4d3ae98583a87/wenesoxevuposujupokomenen.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210626/file/16246741668108.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feafc44d2c---zedibebajalijok.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/78392665493.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/595u1tn8bvbtm60vorgdvhmdqh/99495476590.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079488c7333a---zinibijalusutedol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=volume+of+cuboid+word+problems+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 10712 bytes
SHA-256: 0f9a430af1183b1247315523114b38d86e26ee5b41b6f1aade378d79cec7d196